The American practical navigator : being an epitome of navigation and nautical astronomy (1888)
Bowditch, Nathaniel, 1773-1838, United States. Navy Dept. Bureau of Navigation, Cooper, Philip Henry, 1844-1912 · Washington : Govt. Print. Off. · leaf 98
v,and z in the larger, forming the sphericaltriangle .rj-r:, or xvz.* But since the centre of the earth shouldbe the point from which all angular distancesshould be measured, the observer, by trans-ferring himself there, will find, projected onthe celestial concave, not only the heavenlybodies, but… … Fig. 40. Art. 159. \Mth regard to the motion of the various points and circles projected on the celestial concave,it must be considered that those dependent upon the observers position have a different motion from those whichremain the same, no matter from where viewed. It would be well, therefore,…
Navigation · Nautical astronomy
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