American practical navigator: an epitome of navigation and nautical astronomy (1914)
Bowditch, Nathaniel, 1773-1838, Logan, George Wood, 1868-1915, United States. Navy Dept. Bureau of Equipment · Washington, Govt. Print. Off · leaf 120
T. is 4h 00m 00s a. m., we know that it will be 12h-4h equals 8h before thesun crosses the local meridian; hence we lay off the arc QSm to equal the sunsH. A., which equals 8h, 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 lh 58m 428.2, which is the amount the hour circle of the meansun is to the eastward of the hour circle of the…
Navigation · Nautical astronomy
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