On 22 March your 0519 DR position is LAT 27°20.6'N, LONG 69°25.6'W. You observe an unidentified star bearing 051°T at an observed altitude (Ho) of 50°03.7'. 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 051&deg;T at an observed altitude (Ho) of 50&deg;03.7'. The chronometer reads 10h 16m 47s, and is 02m 15s slow. What star did you observe?

Accepted Answer

Option A: Deneb. Convert chronometer time to GMT, then determine GHA Aries and SHA of the star. Using the DR position, calculate the Local Hour Angle (LHA) and Declination. Comparing these coordinates against the Nautical Almanac star list confirms Deneb, matching the observed altitude and bearing through the intercept method.

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 051&deg;T at an observed altitude (Ho) of 50&deg;03.7'. 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 051°T at an observed altitude (Ho) of 50°03.7'. The chronometer reads 10h 16m 47s, and is 02m 15s slow. What star did you observe?