History of the planetary systems from Thales to Kepler (1906)
Dreyer, J. L. E. (John Louis Emil), 1852-1926 · Cambridge University Press · leaf 281
e chapter in which the new theory is set forth. xi] Oriental Astronomers 269 the greater circle1. These two circles may now be assumed tobe the equators of two spheres, and for the point we maysubstitute a sphere representing the moons epicycle (1 in thefigure). Nasir ed-din assumes another sphere… … The thick line is not a circle. All the others are circles. great, so as not to take up too much space. He next assumestwo more spheres, one (3) which corresponds to the. smallersphere in the above proposition, and the diameter of which isequal to the distance of the centre of the deferent in…
Astronomy -- History · Solar system
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