Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 54
cceeded in tabulating the positionof 1,022 of them. CHAP. III.] IIIPPARCHUS AND PTOLEMY. 31 It is to the use of this instrument that we owethe discovery of the precession of the equinoxes. After Hipparchus had fixed the position of a num-ber of stars, he found that on comparing the placeamongst… … Fig. 10.—Diagram Illustrating the Precession of the Eijuinoxes. got to the place amongst the stars where it crossedin the time of Aristillus; in fact, he found that theequinoctial points retrograded along the equator, andPtolemy (b.c. 135) appears to have established thefact that the whole heavens…
Astronomy · Telescopes
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