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- Q135 - Navigation Problems: Oceans
367. On 6 March at 0550 zone time, morning stars were observed, and the vessel's position was determined to be LAT 23° 56.0' N, LONG 27° 19.0' W. Your vessel is steaming at 25.0 knots on a course of 149.0° T. A sextant observation of the Sun's lower limb is made at 0830 zone time. The chronometer reads 10h 32m 05s, and the sextant altitude is 31° 31.5'. The index error is 2.5' on the arc, and the chronometer error is 01m 45s fast. Your height of eye on the bridge is 76.0 feet. What is the azimuth (Zn) of this sight using the assumed position?
The correct azimuth is 112.8T, determined by advancing the DR to the sight time, calculating the Local Hour Angle (LHA) from the Sun's Greenwich Hour Angle (GHA) and longitude, and then using the assumed latitude, Sun's declination, and LHA in sight reduction.
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