On 17 March your 0520 DR position is LAT 27°23.0'N, LONG 39°42.0'W. You observe an unidentified star bearing 110°T at an observed altitude (Ho) of 50°47.2'. The chronometer reads 08h 22m 15s, and is 01m 45s fast. What star did you observe?

Question

On 17 March your 0520 DR position is LAT 27&deg;23.0'N, LONG 39&deg;42.0'W. You observe an unidentified star bearing 110&deg;T at an observed altitude (Ho) of 50&deg;47.2'. The chronometer reads 08h 22m 15s, and is 01m 45s fast. What star did you observe?

Accepted Answer

Option D: Altair. Calculate UTC from chronometer time. Determine GHA Aries and SHA for 17 March. Compute LHA and GHA of the star. By comparing the calculated coordinates with the observed bearing and altitude, Altair is identified as the celestial body matching the specific positional data for the given DR position.

On 17 March your 0520 DR position is LAT 27&deg;23.0'N, LONG 39&deg;42.0'W. You observe an unidentified star bearing 110&deg;T at an observed altitude (Ho) of 50&deg;47.2'. The chronometer reads 08h 22m 15s, and is 01m 45s fast. What star did you observe?

On 17 March your 0520 DR position is LAT 27°23.0'N, LONG 39°42.0'W. You observe an unidentified star bearing 110°T at an observed altitude (Ho) of 50°47.2'. The chronometer reads 08h 22m 15s, and is 01m 45s fast. What star did you observe?