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Feb 12, 1504
Copernicus's Heliocentric Idea
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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Feb 10, 1572
Cassiopeia
Tycho discovered a new star in the constellation Cassiopeia in 1572.
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Feb 10, 1574
Tycho Brahe's Lectures
In 1574, Tycho gave a course of lectures on astronomy at the University of Copenhagen.
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Feb 8, 1576
Uraniborg Finished On Hven Island
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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Tycho Hired Kepler
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 of Planetary Motion
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 of Planetary Motion
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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Galileo Galilei's Findings
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. -
Kepler's Third Law of Planetary Motion
Kepler's third law: the squares of the periodic times are to each other as the cubes of the mean distances. -
Rhea
Rhea was the second of Saturn's moons that Cassini Discovered.
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Lapetus
Lapetus was the first of Saturn's moons that Giovanni Cassini discovered.
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Tethys
Tethys was the third of Saturn's moons that Cassini discovered.
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Dione
Dione was the last moon of Saturn that Cassini discovered.
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