On 22 July your 1759 DR position is LAT 24°50.2' S, LONG 05°16.0' E. You observe an unidentified star bearing 100°T at an observed altitude (Ho) of 61°48.2'. The chronometer reads 06h 01m 31s, and is 02m 15s fast. What star did you observe?

Question

On 22 July your 1759 DR position is LAT 24&deg;50.2' S, LONG 05&deg;16.0' E. You observe an unidentified star bearing 100&deg;T at an observed altitude (Ho) of 61&deg;48.2'. The chronometer reads 06h 01m 31s, and is 02m 15s fast. What star did you observe?

Accepted Answer

Option B: Antares. Determine the LHA by combining the GHA of Aries and the star's SHA. Using the observed altitude and DR latitude, calculate the star's position. Comparing the computed azimuth and altitude against the Nautical Almanac star list confirms the observed body is Antares, consistent with the celestial navigation data provided.

On 22 July your 1759 DR position is LAT 24&deg;50.2' S, LONG 05&deg;16.0' E. You observe an unidentified star bearing 100&deg;T at an observed altitude (Ho) of 61&deg;48.2'. The chronometer reads 06h 01m 31s, and is 02m 15s fast. What star did you observe?

On 22 July your 1759 DR position is LAT 24°50.2' S, LONG 05°16.0' E. You observe an unidentified star bearing 100°T at an observed altitude (Ho) of 61°48.2'. The chronometer reads 06h 01m 31s, and is 02m 15s fast. What star did you observe?