On 8 April your evening DR position is LAT 22°16' N, LONG 157°58.3' W. You observe an unidentified star bearing 246°T at an observed altitude (Ho) of 58°45.5'. The chronometer reads 05h 09m 57s, and is 01m 23s slow. What star did you observe?

Question

On 8 April your evening DR position is LAT 22&deg;16' N, LONG 157&deg;58.3' W. You observe an unidentified star bearing 246&deg;T at an observed altitude (Ho) of 58&deg;45.5'. The chronometer reads 05h 09m 57s, and is 01m 23s slow. What star did you observe?

Accepted Answer

Option D: Betelgeuse. Calculate the GHA and LHA using the corrected chronometer time. By comparing the observed altitude and bearing against the calculated values derived from the Nautical Almanac for the given DR position, the celestial coordinates uniquely identify Betelgeuse as the observed body.

On 8 April your evening DR position is LAT 22&deg;16' N, LONG 157&deg;58.3' W. You observe an unidentified star bearing 246&deg;T at an observed altitude (Ho) of 58&deg;45.5'. The chronometer reads 05h 09m 57s, and is 01m 23s slow. What star did you observe?

On 8 April your evening DR position is LAT 22°16' N, LONG 157°58.3' W. You observe an unidentified star bearing 246°T at an observed altitude (Ho) of 58°45.5'. The chronometer reads 05h 09m 57s, and is 01m 23s slow. What star did you observe?