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 89
rough the Zenith, and vertical at the place of the obeenror, aniare measured from the Horizon towards the Zenith. The Prime Vertical is the vertical circle passing through the East and West points in the centre, andappears a^ a straight line. Zenith Distance is the distance of any heavenly body… … hk this Figure the Earth ts supposed to be a mere Point in the Centre, and the Spectator situated at a distance to the Eastward of it. g TO CONSTRUCT THE FIGURE. Construct this figure in the same manner as in the preceding one. Then take 23° 28 (the extent of theSuns Declination North or South of…
Navigation · Nautical astronomy
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