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 95
place of the Star, and its Distance measured from the Horizon, is the Altitude required.Now, as the Elevation of the upper end of the Equator above the Horizon, is equal to the Co-Latitude ofthe place, which is North, and the Declination of the Star being also North, their Sum is the… … TO CONSTRUCT THE FIGURE. With the Chord of 60*, describe a semi-circle as before, which will represent the Prime Vertioal CireleDraw the Rational Horizon line, and at right angles to it from the centre, draw the Meridan line or Circle.The Spectator is now facing the South. The Prime Vertical Circle…
Navigation · Nautical astronomy
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