On 22 April your 1852 DR position is LAT 23°54.5'N, LONG 117°36.8'W. You observe an unidentified star bearing 077°T at an observed altitude (Ho) of 18°58.7'. 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 077&deg;T at an observed altitude (Ho) of 18&deg;58.7'. The chronometer reads 02h 54m 53s, and is 02m 51s fast. What star did you observe?

Accepted Answer

Option A: Arcturus. Calculate GHA Aries using the chronometer time and date. Apply the DR longitude to find LHA Aries. Using the observed altitude and bearing, enter the Nautical Almanac and Sight Reduction Tables (Pub. 229). Comparing the calculated intercept and azimuth confirms Arcturus as the celestial body observed at the given coordinates.

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 077&deg;T at an observed altitude (Ho) of 18&deg;58.7'. 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 077°T at an observed altitude (Ho) of 18°58.7'. The chronometer reads 02h 54m 53s, and is 02m 51s fast. What star did you observe?