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QB41 .K38A "Astronomia nova aitiologetos [romanized] : sev physica coelestis, tradita commentariis de motibvs stellae Martis, ex observationibus G. V. Tychonis Brahe, jussu & sumptibus Rvdolphi II ... plurimum annorum pertinaci studio elaborata Pr agae ... /"
"Kepler, Johann, 1571-1630"

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Johann Kepler, 1571-1630. Astronomia nova aitiologetos [romanized] : sev physica coelestis, tradita commentariis de motibvs stellae Martis, ex observationibus G. V. Tychonis Brahe, jussu & sumptibus

Rvdolphi II ... plurimum annorum pertinaci studio elaborata Pragae ... /

[Heidelberg : G. Voegelinus], 1609.

Of the three laws of planetary motion discovered by Kepler, two were announced in this book. With these demonstrable laws, such devices as epicycles, deferents, equants and other efforts to explain planetary motion were swept away. Copernicus in his computations had referred planetary motions to the center of the earth's orbit, but Kepler referred them to the sun itself, thereby paving the way for a real center of force and making possible the Newtonian celestial mechanics. Kepler concluded that 1. Planets describe ellipses about the sun in one focus. 2. the radius vector drawn from the sun to a planet describes equal areas in equal times. (Heralds of Science, 1955 p. 11)



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