On 12 June your 1945 DR position is LAT 21°47.0'N, LONG 46°52.0'W when you observe a faint unidentifiable star through a break in the clouds. The star bears 130°T at a sextant altitude (hs) of 45°21.2'. The index error is 0.5' on the arc, and the height of eye is 45 feet. The chronometer reads 10h 43m 27s, and the chronometer error is 1m 46s slow. What star did you observe?

Question

Accepted Answer

Option B: Beta Librae. Correct the sextant altitude for index error and dip to find Ho. Determine GHA and Declination for the observed time. Using the intercept method or sight reduction tables, compare the calculated azimuth and altitude to identify Beta Librae, which matches the observed bearing and altitude.