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Updated: May 29, 2025
Napier's invention of logarithms at once attracted Kepler's attention.
The only reason for Kepler's angels was his ignorance of the causes of planetary motion.
Of the facts of Kepler's external life, we may simply say, for the sake of readier apprehension, that, after remaining six years at Graetz, he, in 1600, on the invitation of Tycho Brahe, Astronomer Royal to Rodolph II. of Germany, removed to Prague and associated himself with Tycho, who shortly afterwards dying, Kepler was appointed in his place.
With regard to the great vortices, they are still more chimerical, and it is impossible to make them agree with Kepler's law, the truth of which has been demonstrated. Sir Isaac shows, that the revolution of the fluid in which Jupiter is supposed to be carried, is not the same with regard to the revolution of the fluid of the earth, as the revolution of Jupiter with respect to that of the earth.
Number of Kepler's published Works His numerous Manuscripts in 22 folio volumes Purchased by Hevelius, and afterwards by Hansch Who publishes Kepler's Life and Correspondence at the expense of Charles VI. The History of the rest of his Manuscripts, which are deposited in the Library of the Academy of Sciences at St Petersburg General Character of Kepler His Candour in acknowledging his Errors His Moral and Religious Character His Astrological Writings and Opinions considered His Character as an Astronomer and a Philosopher The Splendour of his Discoveries Account of his Methods of Investigating Truth.
His daughter, Susanna, the wife of Jacob Bartsch, a physician who had helped Kepler with his Ephemeris, lost her husband soon after her father's death, and succeeded in obtaining part of Kepler's arrears of salary by threatening to keep Tycho's manuscripts, but her stepmother was left almost penniless with five young children.
Kepler's fame does not rest upon his voluminous works. With his peculiar method of approaching problems there was bound to be an inordinate amount of chaff mixed with the grain, and he used no winnowing machine. His simplicity and transparent honesty induced him to include everything, in fact he seemed to glory in the number of false trails he laboriously followed.
Kepler's own suggested explanation of the discordances was that they must be due to erroneous measures of the planetary distances, and this, in those days of crude and infrequent observations, could not easily be disproved.
Kepler's knowledge of astronomy was limited to the compulsory school course, nor had he as yet any particular leaning towards the science; the post, moreover, was a meagre and unimportant one.
These are Kepler's first and second Laws though not discovered in that order, and it was at once clear that Ptolemy's "bisection of the excentricity" simply amounted to the fact that the centre of an ellipse bisects the distance between the foci, the sun being in one focus and the angular velocity being uniform about the empty focus.
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