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In 1504 Nicolaus Copernicus began to research the idea of a heliocentric world in order to back up his argument against the church.
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Tycho discovered a new star in the constellation Cassiopeia in 1572.
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In 1574, Tycho gave a course of lectures on astronomy at the University of Copenhagen.
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The observatory was started in 1576 and was finished in 1580. It was built on Hven Island and Tycho spent years on the island. He was the first person to record astronomical data. The observatory was named Uraniborg.
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Kepler had just gotten out of school with plenty of knowledge about math, but there were no jobs that involved math except with Tycho so he went to Hven Island to work at Uraniborg.
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Kepler's second law: an imaginary line joining a planet and the sun sweeps out an equal area of space in equal amounts of time.
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Kepler's first law: planets move in ellipses with hte sun at one focus. This was the first of three laws Kepler discovered. 1605 is when Kepler announced the law.
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In Galileo's book(The Starry Messenger) he states the moon is a sphere with craters rather than flat and smooth. He had also noticed that Venus had phases, similiar to the moon, which proves it orbits the sun and that Jupiter had its own moons that didn't go around Earth.
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Kepler's third law: the squares of the periodic times are to each other as the cubes of the mean distances.
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Rhea was the second of Saturn's moons that Cassini Discovered.
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Lapetus was the first of Saturn's moons that Giovanni Cassini discovered.
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Tethys was the third of Saturn's moons that Cassini discovered.
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Dione was the last moon of Saturn that Cassini discovered.
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