A London encyclopaedia, or universal dictionary of science, art, literature and practical mechanics : comprising a popular view of the present state of knowledge : illustrated by numerous engravings, a general atlas, and appropriate diagrams (1829)
Curtis, Thomas, fl. 1820 · London : Thomas Tegg · leaf 290
s at the instant. Let A in the annexed figure represent the firstpoint of Aries; S and S, the true and meanplaces of the sun ; G Greenwich, and B, C, anyother two places, P being the pole. Then G P A,G P S, and G P S, are respectively the siderial,apparent, and mean time at Greenwich ; B PA,B P S,… … of any place on the meridian P B, westeny. AndCPA—GPA, or C PS—GPS, or CPS—GPS,z:GPC, the longitude of C, or of anyplace on the meridian PC, and easterly. Henceit appears that the difference between the siderialtime at tlie first meridian and the siderial time atany other meridian is the longitude…
Encyclopedias and dictionaries · Aeronautics
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