A new treatise on the practice of navigation at sea : containing all the details necessary to enable the mariner to become a good practical navigator. (1902)
Thoms, William · New York : Printed for the author and sold by John Bliss & Co · leaf 149
10* 40 Westerly. Question 2d.—Sept. 2l8t, 1854. In Latitude 26 32North, the Suns bearing by Compass at Settincwas West 6° 15 South. Required the Variation. Answer.—The True AmpHtude is W. 1* 7 N., and the Variation 7* 22 Easterly. MA NAUTICAL ASTROPiuMY. FINDING THE VARIATION OF THE COMPASS FROM AN… … Ir this Figure the Suns True Altitude is 25, his Declination 17° South, and the Latitude 38 SO^Nortl ;•fil i will be perceived that the Co-Altitude, or the Suns distance from the Zenith, the Polar Distance,and the Co-Latitude are given, which form the three sides of an Oblique Spherical Triangle,…
Navigation · Nautical astronomy
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