On 22 March your 0519 DR position is LAT 27°20.6'N, LONG 69°25.6'W. You observe an unidentified star bearing 200°T at an observed altitude (Ho) of 33°05.5'. The chronometer reads 10h 16m 47s, and is 02m 15s slow. What star did you observe?

Question

On 22 March your 0519 DR position is LAT 27&deg;20.6'N, LONG 69&deg;25.6'W. You observe an unidentified star bearing 200&deg;T at an observed altitude (Ho) of 33&deg;05.5'. The chronometer reads 10h 16m 47s, and is 02m 15s slow. What star did you observe?

Accepted Answer

Option D: Antares. Convert chronometer time to UTC, then determine GHA Aries and LHA Aries. Using the DR position, calculate the LHA of the star. By comparing the observed altitude and bearing against the Sight Reduction Tables (Pub. 229) for the calculated LHA and declination, the star is identified as Antares.

On 22 March your 0519 DR position is LAT 27&deg;20.6'N, LONG 69&deg;25.6'W. You observe an unidentified star bearing 200&deg;T at an observed altitude (Ho) of 33&deg;05.5'. The chronometer reads 10h 16m 47s, and is 02m 15s slow. What star did you observe?

On 22 March your 0519 DR position is LAT 27°20.6'N, LONG 69°25.6'W. You observe an unidentified star bearing 200°T at an observed altitude (Ho) of 33°05.5'. The chronometer reads 10h 16m 47s, and is 02m 15s slow. What star did you observe?