On 22 July your 1759 ZT DR position is LAT 24°50.2' S, LONG 05°16.0' E. You observe an unidentified star bearing 231°T, at an observed altitude (Ho) of 26°10.0'. The chronometer reads 06h 01m 31s and is 02m 15s fast. What star did you observe?

Question

On 22 July your 1759 ZT DR position is LAT 24&deg;50.2' S, LONG 05&deg;16.0' E. You observe an unidentified star bearing 231&deg;T, at an observed altitude (Ho) of 26&deg;10.0'. The chronometer reads 06h 01m 31s and is 02m 15s fast. What star did you observe?

Accepted Answer

Option A: Suhail. Convert chronometer time to GMT and determine GHA Aries and SHA. Calculate the LHA and Declination based on the DR position. Comparing these values to the Nautical Almanac confirms the star is Suhail, as the calculated intercept and azimuth match the observed data provided in the problem.

On 22 July your 1759 ZT DR position is LAT 24&deg;50.2' S, LONG 05&deg;16.0' E. You observe an unidentified star bearing 231&deg;T, at an observed altitude (Ho) of 26&deg;10.0'. The chronometer reads 06h 01m 31s and is 02m 15s fast. What star did you observe?

On 22 July your 1759 ZT DR position is LAT 24°50.2' S, LONG 05°16.0' E. You observe an unidentified star bearing 231°T, at an observed altitude (Ho) of 26°10.0'. The chronometer reads 06h 01m 31s and is 02m 15s fast. What star did you observe?