On 22 June at 0906 EDT (ZD +4), your position is LAT 24°36'N, LONG 69°30'W. You are on course 165°pgc at a speed of 14.8 knots. A sextant observation of the Sun's lower limb is made, and the sextant altitude (hs) is 42°44.0' with an index error of 0.8' off the arc. At this time the chronometer reads 01h 10m 12s, and is 2m 42s slow. If your height of eye is 70 feet, what is the azimuth (Zn) of the sight using the assumed position?

Question

On 22 June at 0906 EDT (ZD +4), your position is LAT 24&deg;36'N, LONG 69&deg;30'W. You are on course 165&deg;pgc at a speed of 14.8 knots. A sextant observation of the Sun's lower limb is made, and the sextant altitude (hs) is 42&deg;44.0' with an index error of 0.8' off the arc. At this time the chronometer reads 01h 10m 12s, and is 2m 42s slow. If your height of eye is 70 feet, what is the azimuth (Zn) of the sight using the assumed position?

Accepted Answer

Option A: Zn 080.4&deg;. Convert the chronometer time to GMT, then determine the Sun's GHA and Dec. Using the assumed position (AP) nearest the DR, calculate the LHA. Apply the Sight Reduction Tables (Pub. 229) to find the azimuth angle (Z), then convert to Zn based on the observer's latitude and LHA.