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 102
direction HE, making IHN = NHE. If IS is parallel to HE, then SlN = NTH = IHN, and SIS = E is the angle between the first and thelast directions of the ray SIHE, which has undergone two reflections at I and H respectively. SI and IH are in a plane passing through IN perpendicular to I; IH, HE, and… … .70 INSTRUMENTS EMPLOYED IN NAUTICAL ASTRONOMY.
Navigation · Nautical astronomy
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