On 22 April your 1852 ZT DR position is LAT 23°54.5' N, LONG 117°36.8' W. You observe an unidentified star bearing 129°T at an observed altitude (Ho) of 27°10.0'. The chronometer reads 02h 54m 53s and is 02m 51s fast. What star did you observe?

Question

On 22 April your 1852 ZT DR position is LAT 23&deg;54.5' N, LONG 117&deg;36.8' W. You observe an unidentified star bearing 129&deg;T at an observed altitude (Ho) of 27&deg;10.0'. The chronometer reads 02h 54m 53s and is 02m 51s fast. What star did you observe?

Accepted Answer

Option C: Gienah. Convert chronometer time to UTC. Determine GHA Aries and SHA for 22 April. Calculate LHA and Declination. Matching these values to the observed bearing of 129°T and altitude of 27°10.0' identifies Gienah, consistent with standard celestial navigation reduction techniques for identifying unknown stars during twilight observations.

On 22 April your 1852 ZT DR position is LAT 23&deg;54.5' N, LONG 117&deg;36.8' W. You observe an unidentified star bearing 129&deg;T at an observed altitude (Ho) of 27&deg;10.0'. The chronometer reads 02h 54m 53s and is 02m 51s fast. What star did you observe?

On 22 April your 1852 ZT DR position is LAT 23°54.5' N, LONG 117°36.8' W. You observe an unidentified star bearing 129°T at an observed altitude (Ho) of 27°10.0'. The chronometer reads 02h 54m 53s and is 02m 51s fast. What star did you observe?