American practical navigator: an epitome of navigation and nautical astronomy (1914)
Bowditch, Nathaniel, 1773-1838, United States. Navy Dept. Bureau of Equipment, Logan, George Wood, 1868-1915 · Washington, Govt. Print. Off. · leaf 121
c. The L. S. T. is then QV, equalsV :^ —Q :^, equals the R. A. :^ —II. A. >|c, equals 14*^ — 2 equals 12 hours. When doubt exists as to the Greenwich date the navigator, by plotting the datain exactly the same way as explained above, can at once remove aU doubt on thesubject and can get the… … TVes-t Fig. 43. CHAPTER X.OOEREOTION OF OBSERVED ALTITUDES, 294. The true altitude of a heavenly body at any place on the earths surfaceis the altitude of its center, as it would be measured by an observer at the center ofthe earth, above the plane passed through the center of the earth at right…
Navigation · Nautical astronomy
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