On 14 January your 0550 ZT DR position is LAT 25°26.0' N, LONG 38°16.0' W. You observe an unidentified star bearing 004.5°T, at an observed altitude (Ho) of 40°10.0'. The chronometer reads 08h 48m 51s and is 01m 22s slow. What star did you observe?

Question

On 14 January your 0550 ZT DR position is LAT 25&deg;26.0' N, LONG 38&deg;16.0' W. You observe an unidentified star bearing 004.5&deg;T, at an observed altitude (Ho) of 40&deg;10.0'. The chronometer reads 08h 48m 51s and is 01m 22s slow. What star did you observe?

Accepted Answer

Option C: Kochab. Calculate the Greenwich Hour Angle (GHA) and Local Hour Angle (LHA) using the Nautical Almanac. By applying the observed altitude (Ho) and DR latitude to the intercept method or star identification tables, the calculated azimuth and altitude match the coordinates for Kochab, confirming its identity based on celestial spherical trigonometry.

On 14 January your 0550 ZT DR position is LAT 25&deg;26.0' N, LONG 38&deg;16.0' W. You observe an unidentified star bearing 004.5&deg;T, at an observed altitude (Ho) of 40&deg;10.0'. The chronometer reads 08h 48m 51s and is 01m 22s slow. What star did you observe?

On 14 January your 0550 ZT DR position is LAT 25°26.0' N, LONG 38°16.0' W. You observe an unidentified star bearing 004.5°T, at an observed altitude (Ho) of 40°10.0'. The chronometer reads 08h 48m 51s and is 01m 22s slow. What star did you observe?