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- Q135 - Navigation Problems: Oceans
200. On 19 November in DR position LAT 20° 03.5' N, LONG 129° 48.0' W, you take an ex-meridian observation of the planet Venus at upper transit. The chronometer time of the sight is 11h 29m 44s, and the chronometer error is 01m 23s slow. The sextant altitude (hs) is 43° 54.3'. The index error is 2.0' off the arc, and your height of eye is 48 feet. What is the latitude at meridian transit?
The latitude at meridian transit is 19 58.0' N. This result is obtained by reducing the sextant altitude for index error and height of eye, correcting for chronometer error, applying the ex-meridian correction using the Nautical Almanac, and then combining the corrected meridian altitude with Venus' declination according to the appropriate latitude-declination rule.
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