Kepler used the detailed observations of Tycho Brahe as the basis for his understanding of the orbits of the planets as ellipses with the Sun at one focus.
Aware of the work of Copernicus, he was convinced of the heliocentric system, and set about to explain all of the observed motions in terms of orbits of the planets around the Sun.
He also showed that his laws were valid for all planets as well as the Moon and the satellites of Jupiter.
His laws of orbital motion apply not only to the planets but also to other systems such as binary stars.
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