On 8 April your evening DR position is LAT 22°16.0' N, LONG 157°58.3' W. You observe an unidentified star bearing 238°T at an observed altitude (Ho) of 50°02.7'. The chronometer reads 05h 09m 57s, and is 01m 23s slow. What star did you observe?

Question

On 8 April your evening DR position is LAT 22&deg;16.0' N, LONG 157&deg;58.3' W. You observe an unidentified star bearing 238&deg;T at an observed altitude (Ho) of 50&deg;02.7'. The chronometer reads 05h 09m 57s, and is 01m 23s slow. What star did you observe?

Accepted Answer

Option D: Alnilam. Calculate the GMT of the observation and determine the GHA of Aries and the SHA of the body. Calculate the LHA using the DR longitude. By comparing the resulting declination and azimuth against the Nautical Almanac, Alnilam is identified as the star matching the observed altitude and bearing.

On 8 April your evening DR position is LAT 22&deg;16.0' N, LONG 157&deg;58.3' W. You observe an unidentified star bearing 238&deg;T at an observed altitude (Ho) of 50&deg;02.7'. The chronometer reads 05h 09m 57s, and is 01m 23s slow. What star did you observe?

On 8 April your evening DR position is LAT 22°16.0' N, LONG 157°58.3' W. You observe an unidentified star bearing 238°T at an observed altitude (Ho) of 50°02.7'. The chronometer reads 05h 09m 57s, and is 01m 23s slow. What star did you observe?