On 22 March your 1834 DR position is LAT 26°13.5'S, LONG 108°36.5'W. You observe an unidentified star bearing 062°T at an observed altitude (Ho) of 23°22.0'. The chronometer reads 01h 32m 37s, and is 01m 50s slow. Which star did you observe?

Question

On 22 March your 1834 DR position is LAT 26&deg;13.5'S, LONG 108&deg;36.5'W. You observe an unidentified star bearing 062&deg;T at an observed altitude (Ho) of 23&deg;22.0'. The chronometer reads 01h 32m 37s, and is 01m 50s slow. Which star did you observe?

Accepted Answer

Option D: Regulus. Convert chronometer time to GMT, then determine GHA Aries and the star's SHA to find the Local Hour Angle (LHA). Using the DR position, calculate the intercept and azimuth. Comparing the calculated azimuth of 062°T and the altitude of 23°22.0' against the Nautical Almanac identifies the body as Regulus.

On 22 March your 1834 DR position is LAT 26&deg;13.5'S, LONG 108&deg;36.5'W. You observe an unidentified star bearing 062&deg;T at an observed altitude (Ho) of 23&deg;22.0'. The chronometer reads 01h 32m 37s, and is 01m 50s slow. Which star did you observe?

On 22 March your 1834 DR position is LAT 26°13.5'S, LONG 108°36.5'W. You observe an unidentified star bearing 062°T at an observed altitude (Ho) of 23°22.0'. The chronometer reads 01h 32m 37s, and is 01m 50s slow. Which star did you observe?