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 115
Mean Sun. This is explained in figure 37, which represents a projec-tion of the celestial sphere upon the equator. If P be thepole; QPQ, the meridian; V, the First Point of iVries; M, theposition of the mean sun (west of the meridian); then QPV, orQ the arc QV, is the sidereal time; QPM, or the arc… … TIME AND THE NAUTICAL ALMANAC. 109 If the mean sun be on the opposite side of the meridian, at M, then the meantime equals 24 —MQ. In this case: QV = VM-MQ, or Sidereal time = Right Ascension of Mean Sun— (24^ —Mean time),= Right Ascension of Mean Sun + Mean time —24. Right ascension being measured…
Navigation · Nautical astronomy
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