History of the planetary systems from Thales to Kepler (1906)
Dreyer, J. L. E. (John Louis Emil), 1852-1926 · Cambridge University Press · leaf 164
hat onenamely which depends on the position relative to the sun; ifthey represented it by means of the epicyclic theory, they madethe epicycle move in longitude in the direct order of the signs[i.e. from west to east] in a circle concentric with the zodiac,while the star moves in the epicycle with… … manner that half the chord is to the part of the line from theeye to the epicycle as the velocity of the centre of the epicycle 1 Ed. Heiberg, n. p. 450. vn] The Theory of Epicycles 153 is to the velocity of the star on the epicycle, then the nearestpoint of intersection of that line with the…
Astronomy -- History · Solar system
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