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 99
oons Parallax isabove 1* sometimes. But when a body is in the Zf-nitb Mh Parallax is 0, because it is seen in the sameline from the centre as from the surface as at Z. The Suns Parallax in Altitude is given in Tabls VI. The Moons Horizontal Parallax, which is in perpetual change, and the Parallax… … This figure repreient* the different methods of observing th^ Altitudes of the Sun and Moon by bringinfIheir upper or lower limbs in contact with the Horizon. No. 1 is an Altitude of the Suns lower limb brought in contact with the Horizon. This it the usualmethod practised at Sea, being the most…
Navigation · Nautical astronomy
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