On 22 March your 1834 ZT DR position is LAT 26°13.5' S, LONG 108°36.5' W. You observe an unidentified star bearing 077°T, at an observed altitude (Ho) of 43°10.5'. The chronometer reads 01h 32m 37s and is 01m 50s slow. What star did you observe?

Question

On 22 March your 1834 ZT DR position is LAT 26&deg;13.5' S, LONG 108&deg;36.5' W. You observe an unidentified star bearing 077&deg;T, at an observed altitude (Ho) of 43&deg;10.5'. The chronometer reads 01h 32m 37s and is 01m 50s slow. What star did you observe?

Accepted Answer

Option D: Alphard. Star identification requires calculating Local Hour Angle of Aries (GHA Aries + DR Longitude) and adding Sidereal Hour Angle to find star's computed azimuth and altitude, matching against observed values to identify Alphard.

On 22 March your 1834 ZT DR position is LAT 26&deg;13.5' S, LONG 108&deg;36.5' W. You observe an unidentified star bearing 077&deg;T, at an observed altitude (Ho) of 43&deg;10.5'. The chronometer reads 01h 32m 37s and is 01m 50s slow. What star did you observe?

On 22 March your 1834 ZT DR position is LAT 26°13.5' S, LONG 108°36.5' W. You observe an unidentified star bearing 077°T, at an observed altitude (Ho) of 43°10.5'. The chronometer reads 01h 32m 37s and is 01m 50s slow. What star did you observe?