Evershed, M. A. (Orr) · London : Gall & Inglis · leaf 121
much more difficult toarrange. Eudoxus used four spheres for each, andthese had in every case to be carefully adjusted tothe very different periods and amplitudes of the 90 EUDOXUS. planetary oscillations. It must be confessed that thescheme failed with the difficult case of Mars, and wasnot quite… … Fig. 19. The spheres of the sun in the system of Eudoxus. The outer sphere turns on its axis A A in a day and night; the inner onits axis a a in a year, in the opposite direction. it merely as the solution of a mathematical problem,or as an embodiment of astronomical knowledo^e. Theperiods of the…
Dante Alighieri, 1265-1321 · Astronomy
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