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Kepler and Kircher on the Harmony of the Spheres
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its motion is seen to accelerate as it approaches perihelion (nearest to the sun) and to decelerate as it move... ount by comparing the daily motion of a planet at perihelion with its daily motion at aphelion, expressed as d... ollowing Kepler’s data, is 106 minutes of arc. At perihelion, it is 135 minutes. The proportion of the two qua... er are: motion at aphelion 270 minutes; motion at perihelion 330 minutes. The proportion 270:330 is approximat