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 120
T. is 4^^ GO* 00« a.m., we know that it will be 12^^-41^ equals 8^ before thesun crosses the local meridian; hence we lay off the arc QSm to equal the sunsH. A., which equals 8^, and draw PSm, the hour circle of the mean sun. We seefrom the figure that the hour angle of the mean sun from Greenwich… … Fig. 40. Greenwich, the date must be April 21, and the G. M. T. is 11 hours. For thisGreenwich date, we get, from the Nautical Almanac (corrected for G. M. T.) theR. A. M. S. equal to I 58™ 42.2, which is the amount the hour circle of the meansun is to the eastward of the hour circle of the Vernal…
Navigation · Nautical astronomy
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