Johannas Kepler came up with three laws of planetary motion. He lived from 1571-1630. Copernicus came up with the first theory of heliocentrism but Kepler perfected it and came up with three more laws.
1.Planets Elliptically orbit the sun, like an uneven ball.
2. Planet orbit the equal area closer to the sun or further from the sun, in the same amount of time.
3.The larger the orbit the slower it takes to complete the orbit.
Retrograde: an object going in the opposite direction of something.
Epicycle: the cursive E's that a planet makes when its in retrograde motion around its orbit.
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