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 148
h the observation, will be found at page 81. When the Magnetic Amplitude, or bearing of the body by the Compass, and the True Amplitude,are both on the same side of the East or West points, that is, when they are both North or both South,their difference is the Variation of the Compass. But when… … BXAMPLE 1. April 2d. 1864. In latitude 88* 30 North, LoDgi-♦ode 52 West, ibe Sun -was observed to Set by CcmpassW. 22° N. Required the Variation of the Compass, April 2d, Suns Declination 4° 55 N. and Lat. 88° 30 N.In Table XXXV, g:ive3 the True Ampli.. .W. 6 2S N.Suns bearing by Compass at Sotting…
Navigation · Nautical astronomy
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