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History of the planetary systems from Thales to Kepler (1906)
Dreyer, J. L. E. (John Louis Emil), 1852-1926 · Cambridge University Press · leaf 195
rmer was between18 and 20 times as far off as the latter. In the book On thesizes and distances of the sun and moon he also indicates themethod of determining the distance of the sun, which accordingto Ptolemy was adopted by Hipparchus, and which for about1600 years was followed by astronomers. It… … the time taken by the moon to cross the shadow, while r is theangular radius of the sun and © and d the parallaxes of sunand moon. It is evident that © + a = r + p.Hipparchus gave r = 16 36 55 and p 2£ times as much2, which,if we with Aristarchus assume <X = 19 ©, gives 0 = 2 54. But Hipparchus…Astronomy -- History · Solar system
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
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