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 115
nverted into mean time by subtractingfrom it the Right Ascension of the Mean Sun. This is explained in figure 37, which represents a projection of the celestial sphere upon the equator. If P be theP°k?> QPQ? the meridian; V, the First Point of Aries; M, theposition of the mean sun (west of the… … or Sidereal time = Mean time + Right Ascension of Mean Sun. TIME AND THE NAUTICAL ALMANAC. 109 If the mean sun be on the opposite side of the meridian, at M, then the meantime equals 24h — MQ. In this case: = VM-MQ, or Sidereal time = Right Ascension of Mean Sun— (24h — Mean time),= Right Ascension…
Navigation · Nautical astronomy
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-167-94.webp)
