On 22 April your 1852 DR position is LAT 23°54.5'N, LONG 117°36.8'W. You observe an unidentified star bearing 248°T at an observed altitude (Ho) of 25°00.9'. The chronometer reads 02h 54m 53s, and is 02m 51s fast. What star did you observe?

Question

On 22 April your 1852 DR position is LAT 23&deg;54.5'N, LONG 117&deg;36.8'W. You observe an unidentified star bearing 248&deg;T at an observed altitude (Ho) of 25&deg;00.9'. The chronometer reads 02h 54m 53s, and is 02m 51s fast. What star did you observe?

Accepted Answer

Option A: Rigel. Convert chronometer time to GMT and determine GHA Aries and SHA. Calculate the LHA and Declination using the DR position. Comparing these coordinates against the Nautical Almanac star list confirms Rigel, as the calculated altitude and azimuth align with the observed data provided in the problem.

On 22 April your 1852 DR position is LAT 23&deg;54.5'N, LONG 117&deg;36.8'W. You observe an unidentified star bearing 248&deg;T at an observed altitude (Ho) of 25&deg;00.9'. The chronometer reads 02h 54m 53s, and is 02m 51s fast. What star did you observe?

On 22 April your 1852 DR position is LAT 23°54.5'N, LONG 117°36.8'W. You observe an unidentified star bearing 248°T at an observed altitude (Ho) of 25°00.9'. The chronometer reads 02h 54m 53s, and is 02m 51s fast. What star did you observe?