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- Q135 - Navigation Problems: Oceans
167. On 17 April your vessel's 1856 zone time DR position is LAT 22° 35.0' N, LONG 63° 15.0' W. At that time, a sextant observation of the star Sirius is made. The sextant altitude is 42° 45.0' and the chronometer reads 10h 59m 27s. The index error is 2.6' off the arc, and the chronometer error is 03m 01s fast. Your height of eye is determined to be 45 feet. What is the computed altitude (Hc) and azimuth (Zn) for this sight using the assumed position?
The computed altitude and azimuth for a star sight are determined through sight reduction using an assumed position, latitude, declination, and local hour angle. Applying these calculations to the provided data yields a computed altitude of 42 51.6' and an azimuth of 214.9T.
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