On 23 September your 1836 DR position is LAT 25°18'S, LONG 162°36'E. You observe an unidentified star bearing 022°T at an observed altitude (Ho) of 13°16'. The chronometer reads 07h 34m 12s, and is 01m 54s slow. What star did you observe?

Question

On 23 September your 1836 DR position is LAT 25&deg;18'S, LONG 162&deg;36'E. You observe an unidentified star bearing 022&deg;T at an observed altitude (Ho) of 13&deg;16'. The chronometer reads 07h 34m 12s, and is 01m 54s slow. What star did you observe?

Accepted Answer

Option A: Deneb. Determine UTC by applying chronometer error. Calculate GHA Aries and SHA for 23 September. Compute LHA and Declination. The resulting coordinates correspond to Deneb. This process follows the standard sight reduction workflow in Bowditch, ensuring the celestial body is correctly identified based on the vessel's DR position.

On 23 September your 1836 DR position is LAT 25&deg;18'S, LONG 162&deg;36'E. You observe an unidentified star bearing 022&deg;T at an observed altitude (Ho) of 13&deg;16'. The chronometer reads 07h 34m 12s, and is 01m 54s slow. What star did you observe?

On 23 September your 1836 DR position is LAT 25°18'S, LONG 162°36'E. You observe an unidentified star bearing 022°T at an observed altitude (Ho) of 13°16'. The chronometer reads 07h 34m 12s, and is 01m 54s slow. What star did you observe?