Solar system, celestial sphere, PZX triangle, compass error by amplitude & azimuth, latitude by meridian altitude & Polaris, Marcq St. Hilaire intercept method, and sight planning.
(a) Define and explain:
(i) Sidereal hour Angle
(ii) Sensible Horizon
(iii) Equinoctial
(b) What do you understand by "Precession of Equinoxes"? How it caused and what are its effects?
(a) The amplitude of a rising star was E 25°N and its altitude when on the prime vertical was 42°. Find the best approximate true altitude of the pole star at its position. (15)
(b) Explain why stars culminate about 4 minutes earlier each day? (15)
(a) State the conditions required for solar eclipse and lunar eclipse. (15)
(b) In latitude 65°N, an observer obtains a lower meridian altitude of a celestial body as 20° bearing north. Calculate the altitude and bearing of the same celestial body at upper meridian passage. (15)
At 0440 hrs by ship's clock on a vessel in DR position 52° 21'N, 027° 50'W, an observation of star 'Deneb' on the meridian gave latitude 52° 26'N. A second sight, obtained at 0500 hrs of star 'Capella', when worked using the original DR, gave azimuth 300° T, intercept 3M towards respectively. The ship was steering 000°(T), at 6 kts. Find by plotting the ship's position at 0500 hrs.
On 17 January 1992, AM, in DR 36°10'S 152° 10'E, the sextant altitude of Sun's LL East of the meridian was 52° 27' I.E. 0.2' of the arc, H.E. 11m. GMT was 16th 23h 24m 18s. Find the P/L and observed Longitude where it cuts the D.R. Latitude.
On 2nd March 1992 in DR 32° 12'S 100° 24'E, the sextant altitude of Venus east of the meridian was 18° 05' when the GMT was 1st 22h 32m 58s. If the HE was 10m and IE 1.3' off the arc, find the direction of the PL and the position there which it passes using the Intercept Method?
(a) On 14th October 1992 in DR Long 105° 20'W, the sextant alt of Mars on the meridian was 62° 12.5' North of the observer. If HE was 12m and IE 3.0' on the arc. Find the observed latitude and position line.
(b) On 14th June 1992, in D.R. lat 20° N long. 036° W, the Moon rose bearing 116° C. If the variation was 3° W, find the deviation on the ship's head.
On 4th March 1992, in DR. 27° 28'N 168° 10'W, the sextant altitude of the Sun's L.L. near the meridian was 56° 18.8' when the GPS showed 04d 23h 13m 43s GMT. H.E. was 11m and I.E. 2.6' on the arc, find the direction of PL and a position through which it passes.
(a) Define the folowing:
(i) GHA
(ii) Right Ascension
(iii) Declination
(iv) Amplitude
(v) Rational Horizon
(b) In Latitude 65°N, an observer attains a lower meridian altitude of a celestial body as 20° bearing North. Calculate the altitude and bearing of the same celestial body at upper meridian passage.
(a) Describe how seasons are caused with the help of a diagram.
(b) To an observer in a certain latitude the sun bore 076°T as theoretical sun rise. Find the lat of the observer if the decl. of the sun was 12° 14'N.
An unknown star rose bearing 123°T. When bearing East, it had a true altitude of 240 30.' Find the observer's lat and the star's declination.
Following simultaneous observations were calculaed using the DR 25° 40'N 140° 10'E
Star X Obs. long 140° 15'E Az 115°T
Star y Intercept 2' towards Az 240°T
Polaris Obs. lat 25° 38'N Az 001°T
Find vessels position.
On 1st Sept. '92 at GMT 31d 22h 11m 36s, a ship in DR position 32° 10'S, 113° 25'E, the sextant altitude of star Procyon was 30° 58' I.E. was Nil, HE was 8m, find the direction of the LP and the observed Long.
On 31st August '92 in DR 60° 06'N, 066° 18'W the sextant altitude of mars was 41° 32.4' at GMT 31D 08H 15M 02S. If H.E. 10m, I.E 2.1' on the arc. Calculate the direction of the PL and the intercept
(a) On 13th Dec LHA Aries 323° 00.4', Sextant altitude of pole star 41° 26', IE 2' on the arc, HE 10m, find the direction of the PL and the posn, through which to draw it
(b) On 14th June 1992, in DR 20°N 36°W the Moon rose bearing 116°S. If variation 3°W, find the deviation on the ship's head.
On 6th Mar '92 in DR 51° 55'N, 171° 10'E, the sextant altitude fo the sun's UL near the meridian was 32° 01.2' when the GPS showed 06D 01H 02M 30S GMT, IE 2' on the arc, HE 30m. Find the direction of the PL and the postion through which it passses.
(a) Explain why Venus is visible as a morning or evening star.
(b) Explain with suitable sketches how are seasons caused giving appropriate dates and duration.
(a) Explain why duration of twilight varies with change of latitude.
(b) Prove: Sin Amp. = Sin Decl x Sec Lat
Find observer's position if True altitude of Sun 44° 10' when bearing 090°T and Decl 11° 3'N and GHA Sun 00° 08.3'.
An observation of a heavenly body gave an intercept 6.7' towards Az 053° T. The DR used for working this sight was 35° 45'S, 46° 44'E. After this sight the vessel steamed 129°T for 45' when the second observation was made which gave intercept 3.7' towards Az 318°. Find the position of the vessel at the time of the second observation if the second sight was worked from ITP run up.
On 17th Jan '92 PM in DR 11° 05'N, 110° 55'E the sextant altitude of the sun's LL was 50° 27' at GMT 17d 06h 19m 57s. HE 14.1 m, IE 2.5' on the arc. Find the direction of the PL and the long where it crosses the DR Lat.
On 31st August '92 at ship in DR 33° 43'S, 03° 40'W, the sextant altitude of spica was 49° 18.5' when the GMT showed 31d 17h 28m 42s. If IE was 3.2' on the arc and HE 14.9m, find the direction of the PL and a position through which it passes using Intercept Method.
(a) On 2nd March 1992, in RD 22° 22'N , 175° 15'E the rising sun bore 102°C. If Variation was 3°E. Find the deviation of compass.
(b) On 1st May '92 AM at ship in DR 40° 26'N , 060° 40'E Mars bore 096°C at 30d 23h 05m 20s GMT. Variation 5°W. Calculate deviation of Compas.
On 23rd Sept '92 in DR 23°40'N, 161° 56'E compute the sextant altitude of the Sun's LL on the meridian if IE 2.3' on the arc, HE 25m.
(a) Define the following:
(i) True Altitude
(ii) Vertical Circle
(iii) Elongation
(iv) Civil Twilight
(v) SHA
(b) To an Observer the true altitude of a star when on the meridian above the Pole was 70° 00' bearing South and below the Pole was 21° 23' bearing North. Calculate the star's declination.
(a) Why is V correction applied to the planets and moon?
(b) What are the conditions for a body to be circumpolar?
(c) When GHA Y was 212° 14' the Easterly Hour Angle of the True Sun was 35° to an observer in Longitude 35°W. Find the RA of the True Sun.
(a) With the aid of a diagram explain when a body may or may not cross the Prime Vertical.
(b) An observer in the south Pole finds the true altitude of a star to be 15° 25'. In what Latitude will the observer find the meridian altitude of the same star double this.
At 0830 in position 48° 30'N 24° 20' W an observation of the sun gave an intercept of 4' towards azimuth 100°T. Ship's Course and Speed was 250°T, 14 Knots. Later at 1130 a second observation of the sun on a bearing of 175°T gave an intercept of '3 away, having run up to the DR Position for the calculation. Required the ship's position at the time of the second observation.
(a) On 5th May 1992, in RD 50° 10'S 064° 15'W the observed Meridian altitude of Saturn North of the observer was 56° 00.3'. If HE was 10 M, find the Latitude and the direction of position line.
(b) On 5th March 1992, in RD 32° 12'N 178° 16'E the rising sun bore 100°C. If variation was 3°E, find Deviation of the compass.
On 5th March 1992, in DR 38° 16'S 115° 14'E the sextant altitude of the sun's lower limb East of the Meridian was 36V 0.12' at GMT 4th March 22h 55m 40s. If IE was 0.8' on teh arc and HE 30 M, find the direction of position line and observed longitude.
On 30 November 1992, PM at ship in DR Posn 35° 20' S 120° 15' W Observed altitude of Venus was 28° 39.6' GMT 1st December 03h 36m 16s HE 15m. Find the direction of position line and the intercept.
On the morning of 1st December 1992, ni Longitude 065° 34' E, the sextant altitude of Pole Star was 23° 01' at 01h 01m 34s GMT. IE 1.2' off the arc, HE 17m. Find the direction of position line and the position through which it passes.
Explain the procedure for change of seasons with suitable diagrams. How would it affect the seasons if the earth's axis was perpendicular to its orbit.
(a) Describe the conditions for a heavenly body to be circumpolar. Substantiate your answer with a suitable sketch.
(b) If the sun's declination is 12° 42'S, in what latitudes will there be:
(i) Phenomenon of Midnight Sun
(ii) Twilight all Night
(iii) Continuous Night
(a) Write short notes on the following, with suitable sketches:
(i) Sidereal period of moon.
(ii) Rational Horizon
(iii) Elongation of an Inferior Planet
(b) A Stationary observer sees a star (declination 30° S) pass through his Zenith at the time of its meridian passage. Calculate its amplitude when west of the meridian.
A vessel steaming on a course of 302°(T) at 20kts made following stellar observations
(i) At 1751, Star A, Az = 135°(T), intercept 4.3' towards
(ii) At 1812, Star B, Az = 056°(T), intercept 1.5' away.
180 RD was used for both sides which is 20° 15'S, 030° 36'W; Determine vessel's position at 1800 hrs.
On 06th March 1992 in DR 00° 09.7'S, 070° 45'W, the sextant altitude of the Moon's LL was 17° 48' when GMT was 23h 10m 30s. If H.E. is 15m & I.E. is 0.4' off the arc, determine the direction of the PL and the longitude where it cuts the DR latitude.
On 16th January 1992, PM at ship in DR 35° 10'S, 127° 45'E at GMT 11h 19m 10s, the sextant altitude of Star SIRIUS was 43° 24.1'. If the I.E. is 0.4' on the arc and H.E. was 15m, find the direction of the PL and the point through which it passes using Intercept method.
On 2nd Sept. 1992, in DR long 090° 06'E, observed altitude of star Rigel on the meridian was 73° 24.2' north of the observer. If dip was 15m find the latitude and direction of PL.
On 10th Oct. 1992, what sextant altitude should be set for observation of Polaris, at the beginning of PM Nautical twilight. Given that DR 30°N, 150°W, HE was 10m and IE 2.0' off the arc. Also find the compass error if observed Az was 001°C.
(a) What is International Date Line? Why is it necesary and how is the date on a ship crosing the International Date Line on an Easterly Course Affected?
(b) Calculate the duration of astronomical twilight in lat 35°N on the day of spring equinox?
(a) What conditions are necessary for a heavenly body to:
(i) Be circumpolar
(ii) Cros Prime Vertical
(iii) Rsie bearing True east
(b) Explain the factors which govern period of daylight for any observer.
A vessel in position 46° 05.0'N 022° 20'W observes the True altitude of a body to be 34° 31' when it is on the prime vertical west of the meridian. Calculate the G.P. of the body
In DR 09° 20'N 177° 25'E a celestial observation gave intercept 5 miles away Azimuth 300°T. Ship then steered 065°T for 10hrs at 15 kts with current ENE @ 2 kts through when second observation gave observed longitude 179° 58'E, Azimuth 205°. DR used for second observation was calculated from ITP of the first observation. Find ship's position at the time of second observation.
On 05th Mar 1992 AM, in DR 30° 11'S 147° 10'E, the sextant altitude of the Suns' LL at GMT 04d 22h
56m 04s was 35° 59.1'. If the IE 0.3' off the arc HE was 30m. Find the direction of PL and the longitude where it crosses the DR Lat.
On 1st May 1992, PM in DR 27° 54'S, 179° 18'W, an intercept was worked using jupiter. The sextant altitude of jupiter was 46° 25.5' at GMT 06h 20m 42s. If IE was 1.3' off the arc, HE was 19m. Find the direction of the PL and the position through which it passes.
(a) On 16th Jan 1992 in RD 011° 20'W observed meridian altitude of Star Markab North of observer was 52° 46.9'. If HE was 12.7 meters find direction of position line and latitude to draw it. Calculate GMT meridian passage of star to nearest second.
(b) On 19th Jan 1992 in DR 30° N 060° 35' East 0310 hrs LMT Compass bearing of Moon at GMT 23h 10m 00s was 296°C. If variation was 2.7°W find the deviation of the compass heading.
On 24th Aug 1992 at ship in DR 40°S, 175° 30'W Sextant altitude of Sun UL near the meridian at GMT 23h 27m 12s was 39° 26'. If IE was 2.0' on the arc and HE was 17.5 meters, find the direction of position line and latitude to draw same.
(a) With the help of suitable diagram define the folowing:
(i) First point of Aries
(ii) LHA
(iii) SHA
(b) If the Sun Rose at 0605 hrs LMT and set at 1743 hrs LMT, find the value of equation of time.
For an observer in position 00°N 022°W, the true altitude of a star is 59° 24' and T.Az is 210° calculate the Geographical position.
Explain with suitable sketches:
(a) Why stars rise 4 minutes earlier each day?
(b) Venue is a morning or evening star.
In DR 33° 18'S 000° 12.6'W, a stellar Observation gave an intercept of 4.2' away, bearing 241°(T). After steaming 090°(T) for 12.3 miles another astronomical observation gave an Observed Longitude of 002° 20E'
bearing 090°(T). The position used for the second sight was obtained by allowing run from the first ITP. Find the position of the ship at second observation.
On 25th Feb 1992, in DR 35° 18'S 088° 52.6'W, the sextant altitude of the moon's UL was 47° 12.4' at GMT 25d 15h 11m 20s, HE 18m, IE 0.5' off the arc. Find the observed longitude and direction of PL.
On 19th Jan 1992 in DR 00°02'N, 170° 50'E , the sextant altitude of the star BETELGUESE was 43° 11.1' at 19d 07h 35m 02s, GMT. If HE was 18m, and IE 1.3' of the arc, find the intercept and the direction of the PL.
(a) On 21st Jan 1992 at 0320 ship's time, in DR 44° 12'N 122° 18'E, the star DENEB bore 031.5°C. If the variation was 5°E and the difference between ship's time and GMT is 7 hrs, find the deviation.
(b) On 22nd Sep 1992, in DR 30° 06'N 179° 45'W the seting Sun bore 275°C. If the variation was 2°W, find the deviation of the compass.
Find the position line and position through which it passes in following case:
DR 28° 25'N 027° 25'W, the sextant altitude of the POLE STAR was 27° 45, IE 1.0' off the arc and HE 16m, month March & GHA Aries 270° 14.4'.
(a) On the plane of Rational Horizon, for an Observer located on the Equator, show with adiagram.
(i) Star A has Declination 20° North, Star B has Declination 15° South.
(ii) What is the amplitude and raising bearing of Stars A and B as per the above diagram.
(b) Asuming the earth's radius to be 3960 miles and the moon's Horizontal Paralax to be 58.0'. Calculate the distance of the moon from the Earth.
(a) Draw a figure and proove:
Sin Parallax in Altitude = Sin HP x Cos App altitude
(b) What conditions are necessary (with a neat sketch)
(i) For a body to cross the prime vertical
(ii) For a body to be circumpolar
(a) The moon's altitude at the North Pole was 19° 10'. In what Latitude the meridian altitude of the moon be double this?
(b) Why does the times of Meridian Passage of the moon differ each day?
In DR 33° 18'S 000° 12.6'W, a stellar Observation gave an intercept of 4.2' towards Az 241°(T). After steaming 090°(T) for 12 M another astronomical observation gave an Obs Long of 002° 18.5'E bearing 140°(T). The EP used for working the second observation was obtained through the first ITP. Find the position of the ship at the second observation.
On 17th Jan 1992 AM at ship in DR 31° 41' N 100° 10' E. The sextant altitude of Venus was 19° 48.6' GMT 16d 23h 39m 38s. If IE was 2.1' on the arc and HE was 12m, find the direction of Position Line and the position through which to draw it. Calculate by Longitude by Chronometer.
On 30th April 1992, PM at ship in DR 34° 18' S, 40° 20' W, the observed altitude of star Sirius was 57° 50.7' at GMT 30d 20h 51m 23s. If HE was 21m. Find the direction of the PL and the position through which it passes. Calculate by Intercept Method.
On 2nd May 1992, in DR 15° 36'S, 080° 11' W, the sextant altitude of the Sun's LL near the meridian was 58° 25.6' at GMT 02d 17h 37m 48s. If IE was 1.6' on the arc and HE was 15 m, find the direction of the LP and the Latitude where it cuts the DR Long.
(a) On the morning of 1st Dec 1992, in DR 47° 16' N 143° 26' Ethe sextant altitude of Pole star was 46° 50.7' at GMT 30d 20h 56m 26s. fI El was 2.1 of the arc and HE was 17m, find the direction of the LP and a position through which it passes.
(b) On 231d Sept 1992, at GMT 23d 05h 19m 00s, ni DR Lat 36o 08' S078o 50' W, Saturn bore 286°(C). If Variation was 3'W, find the Deviation.
(a) Explain Synodic period and Sidereal period of the moon.
(b) In what Latitude will the ratio of day to night be 1:3 at the time of Winter Solstice in Northern Hemisphere.
(a) Explain with a diagram why Venus is called morning or evening star?
(b) To a stationary observer, an unknown star bore 000°T with True altitude 78° 12.' After 12 hours, the same star bore 180°T with True altitude 18° 54'. Calculate the observer's Latitude and the declination of the star.
(a) If the earth's axis were perpendicular to the plane of its orbit, what would be the effect on seasons if any? Give reasons
(b) To an observer the sun bore 090°T with an altitude of 32° 12' when it had a declination of 6° 12' S and GHA of 44° 06.2'. Find the observer's position.
In DR 56° 11'N 72° 23'E an intercept of 6.3' away from Az 130 T was obtained by astronomical observation. Ship then steamed 243°T for 43 miles, when another astronomical observation gave intercept of 2.2' towards Az 210°T. The DR used for second observation was obtained directly by allowing the run from the first DR. Find the position of the ship at second observation.
(a) On 21st Jan 1992, in DR 24° 36'S 110° 20'W, the sextant altitude of the sun's LL on the meridian was 85° 05.5'. If IE was 1.6' off the arc and HE was 10m find the latitude.
(b) On 5th March 1992, in DR 32° 12' N 178° 16' E, the rising sun bore 100° C. If variation was 3°E, find the deviation of the compass.
On 31st August 1992, PM at ship in DR 10° 11' S 000° 00', the sextant altitude of the Sun's LL was 39° 15' when the GMT was 31d 15h 09m 50s. If IE was 2.5' on the arc and HE was 17m, find the direction of the PL and the position through which to draw it. Solve by Longitude by Chronometer.
On 19 Jan 1992, at about 1900 hrs at ship in DR 00° 02' N 170° 50' E, the sextant altitude of the star Betelgeuse was 43° 11.1' at GMT 19d 07h 33m 44s. If HE was 18m and IE was 1.3' of the arc required the direction of position line and the position through which it passes. Solve by Intercept Method.
On 1st Sept 1992, in DR 23° 18' N 165° 02' E the sextant altitude of the sun's UL near the meridian was 75° 01.7' at GMT 00h 49m 12s. If IE was 3.2' off the arc and HE was 20m, find the direction of position line and the position through which it passes.
(a) Define the following:
(i) Equation of time
(ii) Ecliptic
(iii) Rational Horizon
(iv) Sidereal Hour Angle
(b) Draw a figure reasonably to scale on the plane of rational horizon for an observer latitude 25°S and mark the following on it:
A star having declination 20°5 and azimuth 090°(T).
(a) The amplitude of a rising star was E 25° N and its altitude when on the prime vertical was 42°. Find the best approximate true altitude of the pole star at its position.
(b) Explain why stars culminate about 4 minutes earlier each day.
(a) State the conditions required for solar eclipse and lunar eclipse.
(b) In latitude 65°N, an observer obtains a lower meridian altitude of a celestial body as 20° bearing north. Calculate the altitude and bearing of the same celestial body at upper meridian passage.
In DR position 20° 30'N, 179° 50'E an intercept of 5' away, Az 000° (T) was obtained by a stellar observation. The vessel then steered a cource 180° (T) for 20' and 090° (T) for 40'. At the end of this staming a star observation gave an AZ 045° (T) x 2' away. Position used for calculation was initial DR position carried forward. Find the final position of the vessel.
On 21st July 1992 in DR position 36° 06'N 038° 45'W, sextant altitude of Moon's UL was found ot be 55° 15.4' When GMT was 09h 20m 49s. IE: 3.5' on the arc HE 15m. Usnig "long by Chron" method. Find the direction of PL and the position through which it passes.
On 29th November at GMT 11h 29m 20s in DR 25° 36'S 107° 20'W, the sextant altitude of star RIGEL was 35° 07.8'. If HE was 12m IE 0.8' on the arc. Find the direction of the PL and the intercept.
On 1st of May 1992 in DR 32° 00'S, 81° 00'E the sextant altitude of Sun's LL near the meridian was 42° 30' at GMT 01d 06h 33m 40s. If IE was 1.6' on the arc and the HE was 17m. Find the direction of the PL and the Latitude where it cuts the DR Longitude.
(a) On 23rd August 1992 in DR position 20° 00S' 090° 00'W, the sun rose bearing was 090°(C). If variation was 3°W. Find the deviation of the compass?
(b) What altitude should be set on the sextant for the observation of polaries on 10th of October 1992 at the beginning of PM nautical twilight in DR position 30° N 150° W, If I.E. is 2.0' off the arc and H.E. 10m.
(a) What is international date line? Why is it necessary and how is the date on a ship crossing the International Date Line on an Easterly course affected?
(b) Calculate the duration of astronomical twilight in lat 35 deg. N on the day of spiring (vernal) equinox?
(a) State and explain Kepler's law of Planetary motion.
(b) Explain with suitable sketches how are seasons caused giving appropriate dates and duration.
(a) Prove Parallax in Altitude = Horizontal Parallax x Cos App alt.
(b) To an observer, star with declination of 29° 44.6'S bore south when on the meridian. If its true altitude when at the maximum azimuth was 26° 03,' find observer's latitude.
An observation of a heavenly body an intercept 6.7' towards Az 053°T. The RD used for working this sight was 35° 45'S 46° 44'E. After this sight the vessel steamed 129°T for 45' when the second observation was made which gave intercept 3.7' towards Az 318°T. Find the position of the vessel at the time of the second sight was worked from TIP run up.
On 30th Nov 1992 PM, in RD 27° 38'N 140° 22'W , the sextant altitude of the Moon's UL at GMT 30d 23h 12m 18s was 30° 51'. If the IE 1.2' on the arc and HE was 12m, find the direction of PL and the longitude where it crosses the DR Lat.
On 1st May 1992, PM in DR 27° 54'S 179° 18'W, an intercept was worked using Jupiter. The sextant altitude of Jupiter was 46° 25.5' at GMT 06h 20m 42s. If IE was 1.3' off the arc, HE was 19m. Find the direction of the PL and the position through whcih it passes.
(a) On 4th March 1992, in DR 45° 14'N 120° 30'W, compute the sextant meridian altitude of ANTARES, if IE was 3.2' of the arc and HE was 10m.
(b) On 22nd SEP 1992, in DR 30° 06'N 179° 45'W the setting Sun bore 275°(C). If the variation was 2°W, find the deviation of the compass.
On 04th Mar 1992, in DR 27° 28'N 168° 10'W, the sextant altitude of SUN's LL near the meridian was 56° 18.8' at GMT 04d 23h 13m 43s. IF IE 2.6' on the arc and HE 11m, find the direction of the LP and obs through which it passes.
(a) Define the following with neat sketches:
(i) Azimuth
(ii) LHA
(iii) Rational Horizon
(iv) Right Ascension
(v) Amplitude
(b) Sketch and show Rational Horizon diagram for arising body whose Decl. is 10°N and observer's Lat 20°N.
(a) Explain why duration of twilight varies with change of latitude.
(b) Prove: Sin Amp. = Sin Decl x Sec Lat
(a) What conditions are necessary for a heavenly body to
(i) Be circumpolar
(ii) Cross prime vertical.
(b) If an observer is in Lat 45°S and declination of a star is 50°S, calculate upper and lower meridian altitude.
In DR 53° 47'S 178° 37'W the SUN bore 076°(T) intercept 11' away. The ship then steered 284° (T) for 47 miles through a current seting 256° (T) for 7 miles, when the SUN bore 284° (T) intercept 5' towards. The position used for the second sight was obtained by allowing run from original DR. Find the position of the ship at the second observation.
On 1st May '92, PM at ship in DR 19° 54'S 179° 58'W the sextant altitude of Jupiter was 52° 38.5' at GMT 02d 06h 20m 42s. If IE was 0.2' off the arc and HE 17m. Find the direction of the PL and the position through which it passes. Using Long by Chronometer Method.
On 1st May 1992, PM at the ship in DR 27° 54'S , 179° 18'W an intercept was worked using Jupiter. The sextant altitude of JUPITER was 46° 25.5' at GMT 06h 20m 42s, If IE was 1.3' off the arc and HE 19m, find the direction of the PL and the intercept through which it pass.
(a) On 22nd Sept. '92 in DR 35° 10'N , 030° 30'W the sun rose bearing 095°C. If variation was 1.8°W, find Deviation.
(b) A vessel in DR posn. 62° 15'S 179° 57.7'E observed the Azimuth of Spica 312.6°G at GMT 30th April '92 13h 00m 05s. Find out the Gyro course if the vessel intends ot steer 075°T.
On 31st Aug '92 at ship in RD 179° 30' W Sextant Altitude of Pole Star at GMT 31d 17h 2m 26s was 22° 40'. If IE: 1.6' no the arc and HE: 12.5 meters, find the direction of position line and latitude to draw it.
(a) How are seasons caused? Explain with suitable diagram and giving appropriate date?
(b) Compare the conditions necessary for Lunar and Solar eclipse.
(a) With help of a diagram explain why stars culminate 4min earlier each day?
(b) A ship in position 40°N 040°W, declination of sun is 10°N and LHA sun 30°. Calculate the sun's G.P., also of a star whose declination is 20°S, and LHA 337° 30'.
(a) Explain the procedure for identifying a star without the use of a star finder?
(b) A body bore 000° and was at altitude of 10° 12'. The altitude after about 21 hours of the same body was 66° 14' on the bearing of 180°. Find latitude of the observer and declination of the body.
An observer steering 2059(T) at 16 kts obtained folowing observation ni DR 34°27'N 076942'E. Find the observed position at 1803hrs.
1820 - Star 'X' - 167° (T) x 2.2' (T)
1824 - Star 'Y' - 081° (T) x 4.5'(T)
1833 - Star 'Z' - 237° (T) x 0.8'(A)
In DR Lat 27° 40'N, 140° 23'W on 30th November 1992, PM, at ship, the sextant altitude of Moon's upper limb was found to be 30° 51' at GMT 30d 23h 12m 13s. If H.E. was 12m, I.E. NIL, find the direction of position line and a position through which it passes. (use "long by chron" Method).
20th July 1992 on ship in DR position 30° 00'N, 120° 0'W the sextant altitude of "JUPTIER" was 23° 55' when the GMT time read on GPS showed 03hr 30min 30 sec. If the index error = 0.7' on the arc, HE = 21M. Find the intercept and direction of PL.
(a) On 1st May 1992 AM at ship in DR 40° 26'N , 060° 40'E , Mars bore 096°(C) at 30d 23h m5 20s GMT. Variation was 5°W, calculate the deviation of the compass.
(b) On 4th March 1992, in DR 45° 14'N, 120° 30'W, compute the sextant meridian altitude of ANTARES, if IE = 3.2' off the arc and HE 10m.
On January 20th 1992 DR Long 052° 30' W at LMT 1845 hrs an observation of the Pole star gave a Sextant Altitude of 40° 15.5', IE 1.5' off the arc, HE 10 m. Find the direction of the PL and the position through which it passes.
(a) On a certain date, in longitude 030°, LHA Sun was 250°, when GHA γ was 181°. Find SHA Sun.
(b) Why do Stars rise 4 minutes earlier each day?
(a) How is the duration of daylight dependent upon:
(i) Observers' Latitude
(ii) Sun's Declination.
(b) Define:
(i) Observer's Zenith
(ii) Prime Vertical
(iii) Azimuth
(a) Define
(i) Elongation
(ii) Superior conjunction
(iii) Quadrant
(b) State the laws of planetary motion
Vessel steering a course of 334°(T) at 15 knots. At 0300 Hrs, New mangalore (12° 48'N 074° 54'E) bore 090°(T) 40nm off. At 0600 hrs the following observations were made:
TIME | BODY | AZIMUHT | RESULT
0600 | Betelgeuse | 080° (T) | Intercept 2nm (Towards)
0600 | Polaris | 001° (T) | OBS LAT 13° 40'
Find the observed position of the vessel at 0600hrs.
(a) On 6th March 1992 in EP 52° 12'N 170° 40'E, the sextant altitude of the Sun UL near the meridian was 31° 59.8' when the GMT showed 06d 01h 27m 30s. If the IE was 2.3' on the arc and the HE was 40m, calculate the direction of the PL and a position which it passes.
(b) Find the approximate ex-meridian limits for the observation of Sun, using the information provided in (a).
On 29th Nov 1992, at ship in DR 25° 30'S 170° 20'W, the sextant altitude of star RGIEL was 51° 10.3' when the GMT showed 14h 29m 20s, if H.E. was 12m and I.E. 2.8' off the arc, find the direction of the PL and intercept.
(a) On 1st Sept 1992, sextant meridian altitude of Sun's UL was 70° 29.2'. North of the observer in DR longitude 116° 27'W, if IE was 3.2 off the arc and HE was 12m, find the observed latitude state the direction of the PL.
(b) On 1st May 1992, in DR 30°06'N 179° 45'W, the setting Sun bore 285°(C). If variation was 3°W, find the deviation for the ship's head.
On 02nd May 1992, on the ship in DR 15°40'S 079° 58'W, the sextant altitude of Sun's LL near the meridian was 58° 16.5' at GMT 17h 38m 05s. If IE was 1.0' on the arc, HE was 25m, calculate the position and direction of PL.
(a) Explain why Venus is visible in mornings or evenings.
(b) What should the position of Suns' LL when taking amplitude & why?
(a) Define:
(i) Elongation
(ii) Opposition
(iii) Inferior Conjunction.
(b) Find observer's position if Altitude of Sun is 44° 10' when bearing 090° True and its declination at that instant is 1° 13'N and GHA Sun is 0° 06.3'.
(a) What are different types of Solar Eclipses? Explain the conditions which are required for Annular Solar Eclipse to occur.
(b) If Latitude of Observer is 45°S & Declination of a heavenly body is 50°S. Find if the body is circumpolar. If yes, then calculate Upper & Lower Meridian Altitude.
In DR position 33° 18'S 018° 12.6'W, a Stellar observation was taken which gave an Intercept of 4.2' Towards an Azimuth of 241°(T). After steaming an easterly course for 122M, another astronomical observation gave an observed longitude of 015° 41.5'W azimuth 140°(T). The EP used for working the Second observation was obtained by running the first ITP. Find the position of the ship at the second observation.
On 30th April 1992 PM, in DR 12° 37'N 179° 12'W, the sextant altitude of sun's UL was 31°18'. GMT 03h 59m 24s on 1st May, I.E. 3.2' on the arc and HE was 18.7m. Find the direction of PL and the longitude where it crosses the DR lat.
On 1st May 1992, PM at the ship in DR 27° 54'S, 179° 18'W an intercept was worked using Jupiter. The sextant altitude of JUPITER was 46° 25.5' at GMT 06h 20m 42s on 2nd May. If IE was 1.3' off the arc and HE 19m, find the direction of the PL and the intercept.
(a) On 21st Jan 1992, at 0320 ship's time, in DR 44° 12'N, 122° 18'E, the star DENEB bore 031.5°(C). If the
(b) On 21st Feb 1992, In DR 10° 05'N, 103 16'E, the sextant meridian altitude of the Moon s UL was 56° 14.9'. If IE was 1.6' on the arc and HE was 12m, find the latitude and the PL.
On 1st Dec 1992 AM in DR 59° 15'N, 133° 37'E, find the sextant altitude of Pole Star at GMT 30th Nov 18h 40m 20s (error 05m 11s slow). IE was 1.1' off the arc and HE was 15m.
Define the following with neat sketches:
(a) Azimuth
(b) LHA
(c) Rational Horizon
(d) Right Ascension
(e) Amplitude
(a) Explain why duration of twilight varies with change of latitude.
(b) Prove: Sin Amp. = Sin Decl x Sec Lat
(a) Prove Parallax in Altitude = horizontal parallax x Cos app alt.
(b) To an observer, star with declination of 29° 44.6'S bore south when no the meridian. If its true altitude when at the maximum azimuth was 26° 03', find observer's latitude.
An observation of a heavenly body gave an intercept 6.7' towards Az 053°T. The DR used for working this sight was 35° 45'S 46° 44'E. After this sight the vessel steamed 129°T for 45' when the second observation was made which gave intercept 3.7' towards Az 318°T. Find the position of the vessel at the time of the second observation if the second sight was worked from ITP run up.
On 5th Mar 1992 AM, in DR 38° 11'S 151° 10'E, the sextant altitude of the sun's LL at GMT 04d 22h 55m 40s was 35° 59.1'. If the IE 1.3' off the arc and HE was 30m. Find the direction of PL and the longitude where it crosses the DR lat.
On 31st August '92 at ship in DR 33° 43'S 03° 40'W, the sextant altitude of Spica was 49° 18.5' when the GMT showed 31d 17h 28m 42s. If IE was 3.2' on the arc and HE 14.9m, find the direction of a PL and a position through which it passes using intercept Method.
(a) On 21st July 1992 in DR 30°S 175°E the rising suns bore 085° compass. If variation was 8°W find the deviation for the compass heading.
(b) On 13th Oct 92 in DR longitude 048° 36'W observed altitude of Sun UL. North of observer was 78° 09.4'. If HE was 15 meters find the direction of position line and latitude to draw it.
On 23 Sept. '92 in DR 23° 40'N, 161° 56'E compute the sextant altitude of the Sun's LL on the meridian if IE 2.3' on the arc, HE 25m.
(a) State Kepler's laws of planetary motion.
(b) Why is longitude correction applied to obtain moon rise, moonset & moon meridian passage times whereas there is no such correction for sun?
(a) Find the ratio of the period of darkness to the period of daylight in latitude 52° 15'N when the Sun's declination was 21° 25's.
(b) Calculate the LHA of a star whose RA is 67° 30' for an observer in longitude 49° 51'E, when GHA Aries is 192° 35'?
(a) On 02nd March 1992, in DR 15° 30'N, 070° 35'W, calculate exact LMT of meridian passage of star Deneb?
(b) An observer in Latitude 61° 51'S sights star whose declination is 34° 43'S. Find out if this star will be circumpolar and if so calculate the upper and lower meridian altitudes.
At 0440 hrs in DR position 52° 21'N 027° 50'W, a meridian observation of Deneb gave an obs. Lat 52° 26'N. At 0500 hrs usnig DR Capella gave Azmiuht 300°T, Intercept 3' Towards. Ship's course 000°(T), sped 6 Kts. Find ship's at 0440 hrs & 0500 hrs by ploting.
On 02nd Sept 1992 at ship in DR 40° 19.0'S 000° 20'W, the sextant altitude of Sun's UL west of the meridian was 10° 02.0' at GMT 16h 43m 12s. If HE was 25m and IE 2.4' off the arc, find the direction of the PL and that longitude where it cuts the DR latitude.
A ship observes the sextant altitude of Venus to be 28°40.1' in DR position 35° 18.9'S 120° 15.4'W. The sight was taken at GMT 01st December 03h 36m 19s. Index error of the sextant 0.8' off the arc and height of eye 16m. Calculate the Intercept and the direction of position line.
(a) On 21st January 1992, a vessel in DR position 24° 36'S, 110° 20'W observes the sextant altitude of Sun
LL on the Meridian to be 85° 05.5'. If IE is 1.6' off the arc and HE 10m. Calculate the latitude required for plotting the PL. Also find the GMT of meridian passage to the exact second using equation of time.
(b) In DR longitude 116° 27'W, on the 14th of September 1992, the sextant meridian altitude of Sun's upper limb was found to be 70° 27.8' north of the observer. Find the latitude and direction of the position line if the index error was 1.9' on the arc and height of eye 20m.
On the morning of 1st December 1992, in DR 47° 16'N, 143° 26'E, the sextant altitude of the pole star was 46°50.7 at 20h 51m 15s GMT. IF IE was 2.1' off the arc and HE was 17m, find the direction of PL and the position through which it passes.
(a) State Kepler's laws of planetary motion.
(b) Sketch and show Rational Horizon diagram for arising body whose Decl. is 10'N and observer's Lat 20'N.
(a) Find the ratio of the period of darkness to the period of daylight in latitude 52° 15'N when the Sun's declination was 21° 25'S.
(b) Calculate the LHA of a star whose RA is 67° 30' for an observer in longitude 49° 51'E, when GHA Aries is 192° 35'?
(a) On 02nd March 1992, in DR 15° 30'N, 070° 35'W, calculate exact LMT of meridian passage of star Deneb?
(b) An observer in Latitude 61° 51'S sights a star whose declination is 34° 43'S. Find out if this star will be circumpolar and if so calculate the upper & lower meridian altitudes.
An observation of a heavenly body gave an intercept of 6.7' towards azimuth 053°(T). The DR used for working the sight was 35° 45'S, 46° 44'E. After this sight the vessel steamed 129°(T) for 45 miles when a second observation was taken which gave Intercept of 3.7' towards azimuth 318°(T). Find the position of the vessel at the time of second observation if the second sight was worked from I.T.P. run up.
A vessel in DR 27° 39.5'N, 140° 25.5'W, observes the sextant altitude of Moon's upper limb ot be 30° 49.2' at GMT 30th November 1992, 23h 12m 15s. The height of eye of the observer was 20m and the Index error of the sextant Nil. Find the position from where the PL passes and the direction of the PL using longitude by chronometer method.
A ship observes the sextant altitude of Venus to be 28° 40.1' in DR position 35° 18.9'S, 120° 15.4'W. The sight was taken at GMT 01st December 03h 36m 19s. Index error of the sextant 0.8' off the arc and height of eye 16m. Calculate the Intercept and the direction of position line.
(a) A vessel in DR position 62° 15'S, 179° 57.7'E observed the Azimuth of Star Spica to be 312.6° (G) at GMT 30th April 13h 00m 05s. Find out the Gyro course to set if the vessel intends to steer 075°(T).
(b) In DR Longitude 116° 27'W, on the 14th of September 1992, the sextant meridian altitude of Sun's upper limb was found to be 70° 27.8' north of the observer. Find the latitude and direction of the position line if the index error was 1.9' on the arc and height of eye 20m.
On 1st December 1992 in longitude 065° 33.7'E the sextant altitude of the Pole star was 23° 18' at GMT 01d 01h 01m 48s. If index error was 0.3' off the arc & height of eye 23m, find the direction of the position line and the position through which it passes.
(a) What is international date line? Why is it necessary and how is the date on a ship crossing the International Date Line on an Easterly course affected?
(b) Calculate the duration of astronomical twilight in lat 35deg N on the day of spring (vernal) equinox?
Explain how season's are caused?
(a) Prove Parallax in Altitude = horizontal parallax x Cos app alt.
(b) To an observer, star with declination of 29° 44.6'S bore south when on the meridian. If its true altitude when at the maximum azimuth was 26° 03', find observer's latitude.
In DR 53° 47'S 178° 37'W the SUN bore 076°(T)intercept 11' away. The ship then steered 284°(T) for 47 miles through a current setting 256°(T) for 7 miles, when the SUN bore 284°(T) intercept 5' towards. The position used for the second sight was obtained by alowing run from original DR. Find the position of the ship at the second observation.
On 30th Nov 1992 PM, in DR 27° 38'N 140° 22'W, the sextant altitude of the Moon's UL at GMT 30d 23h 12m 18s was 30°51'. If the IE 1.2' on the arc and HE was 12m, find the direction of PL and the longitude where it crosses the DR Lat.
On 01st May 1992, PM in DR 27° 54'S 179° 18'W, an intercept was worked using Jupiter. The sextant altitude of Jupiter was 46° 25.5' at GMT 06h 20m 42s. If IE was 1.3' of the arc, HE was 19m. Find the direction of the PL and the position through which it passes.
(a) On 4th March 1992, in DR 45° 14'N 120° 30'W, compute the sextant meridian altitude of ANTARES, if IE was 3.2' of the arc and HE was 10m.
(b) On 22nd SEP 1992, in DR 30° 06'N, 179° 45'W the seting Sun bore 275°(C). If the variation was 2°W, find the deviation of the compass.
Find the position line and position through which it passes in following case:
DR 28° 25'N, 027° 25'W,the sextant altitude of the POLESTAR was 27° 45', IE 1.0' off the arc and HE 16m, month March & GHA Aries 276° 14.4'.
(a) Define and illustrate by figures:
(i) Celestial Sphere
(ii) Ecliptic
(ili) Vertical Circle
(iv) SHA
(b) Calculate LHA of a star whose RA is 70°, for an observer in longitude 47°E, when GHA γ is 210°.
(a) Define
(i) Elongation
(ii) Opposition
(iii) Inferior conjunction
(b) Why is Venus refered to as a morning or an evening star?
(a) A vessel sails no a RHUMB LINE course of 144° (T) from latitude 15° 40'N and makes a d'long of 47°50'. Find the distance covered and the latitude reached?
(b) Define
(i) Age of Moon
(ii) Lunar Month
(iii) Sidereal Period of Moon
At 0600 hrs in DR 00° 10'S, 135° 12'W a stellar observation bearing 125°T gave longitude of 135° 00'W. Ship steered course 290°T at 15 Kts through a current setting SW at 3 knots throughout. At 1130 hrs an ex-meridian sight of Sun gave observed latitude 00° 03S', Azimuth 185°T. Find the ship's position at the time of Second observation.
On 20th July 1992 a ship in position at equator observed the altitude of Moon UL West of meridian 51° 06.2' at GMT 20d 06h 12m 45s. If IE was 1.5' on the arc and HE was 21 meters find the direction of position line and position to draw the same.
On 30th Nov 1992 in DR position 24° 56'N, 165° 20'E sextant altitude of Sun LL at GMT 29d 2h 28m 42s was 33° 00.5'. If IE was 0.5' on the arc and HE was 12 meters find direction of PL and position to draw position line by intercept method.
(a) On 21st July 1992 in DR 30°S 175°E the rising Sun bore 085° compass. If variation was 8°W find the
deviation for the compass heading.
(b) On 13th Oct 92, in DR longitude 048° 36'W observed altitude of Sun UL North of observer was 78° 09.4'. If HE was 15 meters find the direction of position line and latitude to draw it.
On 31st Aug '92 at ship in DR 179° 30'W Sextant Altitude of Pole Star at GMT 31d 17h 22m 26s was 22° 40'. If IE is 1.6' on the arc and HE is 12.5 Meters, find the direction of position line and latitude to draw it.
(a) Define the following with neat sketches:
(i) Azimuth
(ii) LHA
(iii) Rational Horizon
(iv) Right Ascension
(v) Amplitude
(b) Sketch and show Rational Horizon diagram for arising body whose Decl. is 10'N and observer's Lat. 20'N.
(a) State and explain Kepler's Law of Planetary motion.
(b) Explain with suitable sketches how are seasons caused giving appropriate dates and duration.
(a) What conditions are necessary for a heavenly body to:
(i) Be circumpolar
(ii) Cross prime vertical
(b) If an observer is in Lat 45°S and declination of a star is 50°S, calculate upper and lower meridian altitude.
At 1530 hrs ship's time on a vessel in DR 15° 20'S, 179° 50'W an observation of Sun's bearing 260°(T) gave Observed long 179° 55'W. The vessel then sailed on a course of 265°(T) at 51 knots. At 1900 hrs an observation of Venus gave an intercept of 4' away and Azimuth 165°(T). If observation of Venus was calculated using DR obtained by alowing run to the DR latitude and observed Long at 1530 hrs, find the ship's position at 1900 hrs.
On 1st May '92 PM at ship in RD 19° 54'S, 179° 58'W, the sextant altitude of Jupiter was 52° 38.5' at GMT 02d 06h 20m 42s. If IE was 0.2' of the arc and HE 17m. Find the direction of the PL and the position through which it passes. Using Long by Chronometer Method.
On 1st May '92 PM at the ship in DR 35° 10'S, 016° 00'W the sextant altitude of the star Sirius at GMT 01d 19h 10m 45s was 57° 28.5'. If IE was 2.1' on the arc and HE 11m, find the direction of the LP and the position through which to draw it using Intercept method.
(a) On 22nd Sept '92 in DR 35° 10'N, 030° 30'W the sun rose bearing 095°C. If variation was 1.8°, find deviation.
(b) A vessel in DR posn. 62° 15'S, 179° 57.7'E observed the Azimuth of Spica 312.6° at GMT 30th April '92 13h 00m 05s. Find out the Gyro course if the vessel intends to steer 075°T.
On 15 Sept '92 at ship in Long 178°E, the sextant altitude of the Pole star was 18° 57.4' at 17h 23m 25s GMT, if IE was 1.5' on the arc and HE 13.5m. Find the direction of the PL and the position through which it passes. If Azimuth was 005°(C), and variation 2.3°E, find the deviation.
(a) Define Twilight, Define Civil, Nautical and Astronomical twilight. Explain cause of the Twilight, reason why it lasts longer in higher latitudes.
(b) To an observer, star bore 065°(T) when rising, its true altitude when on prime vertical cast of the meridian was 42°, find the observer's latitude
(a) State and explain Keplers' Law.
(b) In what latitude would the longest day be 5 hours more than the shortest day?
(a) Prove that Sin Amp = Sin Decl. Sec Lat
(b) To an observer in a certian latitude, the sun declination 12° 14'N bore 076°(T) at theoretical sunrise. Find the observer's latitude.
At 1530 hrs ship's time on a vessel in DR 15° 20'S, 179° 50'W an observation of Sun bearing 260°(T) gave an observed long 179° 55'W. The vessel then sailed on a course of 265°(T) at 15 knots. At 1900 hrs an observation of Venus gave an intercept of 4' away and azimuth 165°(T). If the observation of Venus was calculated using DR obtained by alowing run on DR latitude and observed longitude at 1530 hrs, find the position of the ship at 1900 hrs.
On 05th Mar 1992 AM, in DR 38° 11'S 151° 10'E, the sextant altitude of the Sun's LL at GMT 04d 22h 55m 40s was 35° 59.1'. If the IE 1.3' off the arc and HE was 30m. Find the direction of PL and the longitude
where it crosses the DR Lat.
On 1st May 1992, PM at the ship in DR 27° 54'S , 179° 18'W an intercept was worked using Jupiter. The sextant altitude of JUPTIER was 46° 25.5' at GMT 06h 20m 42s, if IE was 1.3' off the arc and HE 19m, find the direction of PL and the intercept through whcih it pass.
(a) On 01st May 1992, AM at ship in DR 40° 26'N, 060°40'E, MARS bore 096° C at 30d 23h 55m 20s GMT. If the variation was 5°W, find the deviation of the compass.
(b) On 04th Mar 1992, in DR 45° 14'N, 120° 30'W, compute the sextant meridian altitude of ANTARES if IE was 3.2' off the arc and HE was 10m.
On 23rd Sept 1992, in DR 23° 40'N, 161° 56'E, compute the sextant altitude of Sun's LL in the meridian if IE 2.3' on the arc, HE 25m.
(a) Explain why Venus is visible as a morning or evening star.
(b) Explain with suitable sketches how are seasons caused giving appropriate dates and duration.
(a) Explain why duration of twilight varies with change of latitude.
(b) Prove: Sin Amp. = Sin Decl. x Sec Lat
Find observer's position if True altitude of Sun 44° 10' when bearing 090°T and Decl. 11° 13'N and GHA Sun 00° 08.3'.
An observation of a heavenly body gave an intercept 6.7' towards Az 053°T. The DR used for working this sight was 35° 45'S 46° 44'E. After this sight the vesel steamed 129°T for 45' when the second observation was made which gave intercept 3.7' towards Az 318°T. Find the position of the vessel at the time of the second observation if the second sight was worked from ITP run up.
On 17th Jan '92 PM in DR 11° 05'N 110° 55'E, the sextant altitude of the Sun's LL was 50° 27' at GMT 17d 06h 19m 57s. HE 14.1m, IE 2.5' on the arc. Find the direction of the PL and the longitude where it crosses the DR Lat.
On 31st August '92 at ship in DR 03° 43'S 03° 40'W, the sextant altitude of Spica was 49° 18.5' when the GMT showed 31d 17h 28m 42s. It IE was 3.2' on the arc and HE 14.9m, find the direction of the PL and a position through which it passes using Intercept Method.
(a) On 2nd March 1992, in DR 22° 22'N 175° 15'E the rising sun bore 102°C. If Variation was 3°E. Fnid the deviation of compass.
(b) On 1st May '92 AM at ship in DR 40° 26'N, 060° 40'E Mars bore 096° C at 30d 23h 05m 20s GMT. Variation 5°W. Calculate deviation of Compass.
On 23rd Sept. '92 in DR 23° 40'N, 161° 56'E compute the sextant altitude of the Sun's LL on the meridian if IE 2.3' on the arc, HE 25m.
(a) Define Daylight Saving Time (DST). What is the purpose of DST?
(b) Find the duration of Astronomical twilight for an observer in Lat 20° 00'S on the day of summer solstice.
(a) Define with diagram on the Rational Horizon:
(i) True Altitude
(i) Azimuth
(iii) Zenith Distance
(b) Two ships on the Equator are 60 miles apart. Both steer 180°T at equal speeds. How many miles will they have to proceed till they are 40 miles apart?
(a) What do you understand by circumpolar Body? What are the conditions necessary for a heavenly body to be circumpolar? Substantiate your answer with a suitable sketch?
(b) If the Sun's declination is 19° 30'N, in what latitude will there be:
(i) Phenomenon of Midnight Sun.
(ii) Twilight all Night.
(iii) Continuous Night.
Due to engine failure while drifting to a SWly current @ 2 Kts, at 0800 hrs Sun sight using DR Lat 00° 05'N gave Obs longitude 179° 55'W Azimuth 100° true. Then again at 1300 hrs an Ex-meridian sight using longitude 179° 55'W gave observed latitude 00° 05'N, azimuth 355° true. Find Ship's position at the time of second observation.
On 20th July 1992 at ship in position at Equator Sext. Altitude of Moon UL West of meridian at GMT 20d 06h 12m 45s was 51° 06.2'. If IE was 1.5' on the arc and HE was 12 meters find the direction of position line and position to draw the same.
On 30th Nov 1992 at ship in DR 30°N, 165° 24' E sextant altitude of Sun UL at GMT 29d 22h 28m 42s was 29° 03'. If IE was 0.5' on the arc and HE was 12 meters find the direction of position line and position to draw the same by intercept method.
(a) On 14 Oct '92 in DR longitude 048° 36'W observed altitude of Sun UL North of observer was 78° 09.4'. If HE was 15 meters find the direction of position line and latitude to draw it.
(b) On 19th January 92 in DR Lat 30°N 060° 30'E. Compass bearing of Moon at GMT 23h 10m 00s was 269°(C). If variation was 2.7°W, find the deviation.
On 31st August '92 at ship in DR 179° 30'W, Sextant Altitude of Pole Star was 22° 30' at GMT 31d 17h 22m 26s. If IE: 1.6' on the arc and HE: 12.5 meters find the direction of position line and latitude to draw it.
(a) Explain the 'v' and 'd' correction given in Nautical Almanac. Why is 'v' correction applied for only certain celestial bodies?
(b) Define 'twilight'. Explain clearly the cause of the phenomena and the reason why it lasts longer in high latitudes.
(a) Define:
(i) Horizontal Parallax
(i) Paralax in Altitude
(b) Draw a sketch & show the relationship between the two.
(a) Write short notes on the followings, with suitable sketches:
(i) Rational Horizon
(ii) Elongation
(b) Find the duration of astronomical Twilight for an observer in Lat 20° 00'S on the day of summer solstices?
In DR 30° 15'N, 26° 40'W at 0945hrs an observation of the Sun gave abearing 110°T intercept 6.5' towards. The vessel then steamed a course 245°T for 2hrs at 10kts when the latitude obtained by meridian altitude of Sun was 30° 00.0'N. Find the vessel's position at the second observation.
On 5th March 1992 AM, in DR 38° 11'S 151° 10'E, the sextant altitude of the sun's LL at GMT 04d 22h 55m 40s was 35° 59.1'. If the IE 1.3' off the arc and HE was 30m. Find the direction of PL and the longitude where it crosses the DR lat.
On 31st August '92 at ship in DR 33° 43'S 03° 40'W, the sextant altitude of Spica was 49° 18.5' when the GMT showed 31d 17h 28m 42s. If IE was 3.2' on the arc and HE 14.9m, find the direction of the PL and a position through which it passes using intercept method.
(a) On 2nd May '92 in DR 15° 40'S 079° 58'W the sextant alt of Sun LL near the meridian was 58° 16.5' at GMT 17h 38m 05s. If IE was 1.0' on the arc and the HE was 25m. Find the direction of the PL and the lat where ti cuts the DR Long.
(b) On 20th January '92 in DR 54° 20'S 46° 27'W the sun set bearing 236°C. If Variation was 3°W, find Deviation.
On 1st Dec '92 in long 65° 33.7'E the sextant altitude of the Pole star was 23° 18' at GMT 01d 01h 01m 48s. If IE was 0.3' off the arc and HE 23m, find the direction of the PL and the position through which to pass it.
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