In this video we solve the problem below.
On 23 June in DR position LAT 21° 39.0' S, LONG 106° 28.0' W, you observe an amplitude of the Sun. The Sun's center is on the celestial horizon and bears 078° psc. The chronometer reads 02h 14m 39s and is 01m 43s slow. Variation in the area is 9° W. What is the deviation of the standard magnetic compass?
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Link to the Nautical Almanac used in the video.
Amazon.com: Nautical Almanac: 9781480202702: Hickethier MBA, Mr. Alexander F.: Books