"By what reasons are you led to make the sun the moving cause or the source of movement for the planets? 1. Because it is apparent that in so far as any planet is more distant from the sun... it moves the more slowly—so that the ratio of the periodic times is the ratio of the 34th powers of the distances from the sun. Therefore we reason from this that the sun is the source of movement. 2. Below we shall hear the same... use in the case of the single planets—so that the closer any one planet approaches the sun during any time, it is borne with an increase of velocity in exactly the ratio of the square.3. Nor is the dignity or the fitness of the solar body opposed to this, because it is... beautiful... of a perfect roundness... very great and is the source of light and heat, whence all life flows out into the vegetables: to such an extent that heat and light can be judged to be... instruments fitted to the sun for causing movement in the planets. 4. But in especial... the sun’s rotation in its own space around its immobile axis, in the same direction in which all the planets proceed: and in a shorter period than Mercury, the nearest to the sun and fastest of all the planets."
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Epitome Astronomiae Copernicanae
' was an astronomy book on the published by Johannes Kepler in the period 1618 to 1621. The first volume (books I–III) was printed in 1618, the second (book IV) in 1620, and the third (books V–VII) in 1621. It was translated from the Latin in 1939 by .
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