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 154
Diagram of an Hour Angle. Latitude and Declination of Contrary Names. Fui. 23. … In Figure 22, the Sun is on the Prime Vertical, the Latitude and Declination being of the same name theDeclination subtracted from 90°, gives the Polar Distance. In Figure 23, the Latitude and Declination being of contrary names, the Declination added to 90*. givesthe Polar Distance. RULES FOR…
Navigation · Nautical astronomy
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