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They compass the whole sweep of Celestial Geometry, and stamp their seer as unapproachably the greatest of astronomers, as well as one of the chief benefactors of mankind. The announcement of Kepler's first two laws was made in his New Astronomy, "Astronomia Nova, seu Physica Caelestis, tradita Commentariis de Motibus Stellae Martis: Ex Observationibus G.V. Tychonis Brahe." Folio. Prague: 1609.
When Tycho learned that Rudolph was particularly fond of mechanical instruments and of chemistry, he resolved to complete and to dedicate to him his work on the mechanics of astronomy, and to add to it an account of his chemical labours. This task he soon performed, and his work appeared in 1598 under the title of Tychonis Brahe, Astronomiæ instauratæ Mechanica.
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