On 22 July your 1759 DR position is LAT 24°50.2' S, LONG 05°16.0' E. You observe an unidentified star bearing 293°T at an observed altitude (Ho) of 17°52.8'. The chronometer reads 06h 01m 31s, and is 02m 15s fast. What star did you observe?

Question

On 22 July your 1759 DR position is LAT 24&deg;50.2' S, LONG 05&deg;16.0' E. You observe an unidentified star bearing 293&deg;T at an observed altitude (Ho) of 17&deg;52.8'. The chronometer reads 06h 01m 31s, and is 02m 15s fast. What star did you observe?

Accepted Answer

Option B: Regulus. Convert chronometer time to GMT and determine the LHA of Aries. Using the observed altitude and bearing, calculate the star's SHA and Declination. Comparing these values against the Nautical Almanac for the given date confirms the body is Regulus, which matches the observed celestial parameters and position.

On 22 July your 1759 DR position is LAT 24&deg;50.2' S, LONG 05&deg;16.0' E. You observe an unidentified star bearing 293&deg;T at an observed altitude (Ho) of 17&deg;52.8'. The chronometer reads 06h 01m 31s, and is 02m 15s fast. What star did you observe?

On 22 July your 1759 DR position is LAT 24°50.2' S, LONG 05°16.0' E. You observe an unidentified star bearing 293°T at an observed altitude (Ho) of 17°52.8'. The chronometer reads 06h 01m 31s, and is 02m 15s fast. What star did you observe?