On 17 March your 1845 DR position is LAT 25°10.0'N, LONG 66°48.0'W. You observe an unidentified star bearing 340°T at an observed altitude (Ho) of 66°25.1'. The chronometer reads 10h 47m 49s, and is 1m 54s fast. What star did you observe?

Question

On 17 March your 1845 DR position is LAT 25&deg;10.0'N, LONG 66&deg;48.0'W. You observe an unidentified star bearing 340&deg;T at an observed altitude (Ho) of 66&deg;25.1'. The chronometer reads 10h 47m 49s, and is 1m 54s fast. What star did you observe?

Accepted Answer

Option D: Capella. Convert chronometer time to GMT, then find the LHA of Aries. Determine the star's SHA and Declination from the Nautical Almanac. By solving the navigational triangle using the observed altitude and bearing, the calculated position matches the coordinates and characteristics of Capella, confirming its identity through standard celestial reduction.

On 17 March your 1845 DR position is LAT 25&deg;10.0'N, LONG 66&deg;48.0'W. You observe an unidentified star bearing 340&deg;T at an observed altitude (Ho) of 66&deg;25.1'. The chronometer reads 10h 47m 49s, and is 1m 54s fast. What star did you observe?

On 17 March your 1845 DR position is LAT 25°10.0'N, LONG 66°48.0'W. You observe an unidentified star bearing 340°T at an observed altitude (Ho) of 66°25.1'. The chronometer reads 10h 47m 49s, and is 1m 54s fast. What star did you observe?