On 17 March your 0520 DR position is LAT 27°23.0'N, LONG 39°42.0'W. At this time you observe an unidentified star bearing 270°T with an observed altitude of 46°30.2'. 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. At this time you observe an unidentified star bearing 270&deg;T with an observed altitude of 46&deg;30.2'. The chronometer reads 08h 22m 15s, and is 01m 45s fast. What star did you observe?

Accepted Answer

Option D: Arcturus. Apply chronometer error to find UTC. Use the Nautical Almanac to determine GHA Aries and SHA. Calculate LHA and Declination. Comparing these values to the observed bearing of 270°T and altitude of 46°30.2' confirms Arcturus, consistent with the celestial navigation principles outlined in the American Practical Navigator.

On 17 March your 0520 DR position is LAT 27&deg;23.0'N, LONG 39&deg;42.0'W. At this time you observe an unidentified star bearing 270&deg;T with an observed altitude of 46&deg;30.2'. 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. At this time you observe an unidentified star bearing 270°T with an observed altitude of 46°30.2'. The chronometer reads 08h 22m 15s, and is 01m 45s fast. What star did you observe?