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 118
e two. Non. When the horizon under the Sun is obstructed by land, the Correctioa for Dip must bo taken from Table Vlll,.when at less distance from the Shore than 6 miles. EXAMPLE 1, Jannary Ist, 1864. In the Longitude of 80* West, the Meridian Altitude of the Suns Lo^er Limb was observedlo be 26*… … Rule.—With the Chord of 60* describe a semi-circle, to represent the concave Arch of the heavens, and draw theRational Horizon. Lay off the Suns Altitude, 27°, on the Left. Take the Declination, 23° S., in the diyiders, (fromth« hne of Chords,) and with one foot in the Suns place, extend the other…
Navigation · Nautical astronomy
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