Kepler biography wikipedia
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Johannes Kepler
Johannes Kepler (27 December – 15 November ) was a Germanmathematics teacher, astronomer, optician, natural philosopher, astrologer and Lutherantheologian.
He was Tycho Brahe's apprentice. Tycho Brahe looked at the way the planets moved in the sky. Johannes Kepler found a simple way to say how the planets move.
Kepler biography wikipedia
Kepler also studied other things like Kepler's supernova.
How the planets move
[change | change source]A planet moves along a path called an orbit. Kepler used three laws to say what form the path has and how fast the planet moves
- Kepler's first law says that the form of the path is an ellipse, an oval or flattened circle that has two centres.
The Sun is in one of the centers of the ellipse. Before Kepler, astronomers thought that planets moved in circles within circles (epicycles) according to the system of Claudius Ptolemy with Earth at the middle of the biggest circle/s.
- Kepler's second law says how fast the planet moves around the ellipse