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Rh predecessor, justly says that the "restoration of astronomy" was "by that Phœnix of astronomers, Tycho, first conceived and determined on in the year 1564."

While occupied with the study of astronomy and occasional observations, Tycho, like everybody else at that time, believed in judicial astrology, and now and then worked out horoscopes for his friends. He even kept a book in which he entered these "themata genethliaca." He mentions in a letter, written in 1588 to the mathematician Caspar Peucer, the son-in-law of Melanchthon, that he had during his stay at Leipzig made out the nativity of Peucer, and found that he was to meet with great misfortunes, either exile or imprisonment, and that he should become free when about sixty years of age, through the agency of some "martial" person. This prediction chanced to turn out correct, as Peucer in 1574 was deprived of his professorship at Wittenberg, and kept in a rigorous imprisonment till 1586, being suspected of a leaning to Calvinism. From a lunar eclipse which took place while he was at Leipzig, Tycho foretold wet weather, which also turned out to be correct.

Tycho left Leipzig on the 17th May 1565 with Vedel