#1. The orbit of every planet is an elipse with the Sun at a focus
#2. A line joining a planet and the Sun sweeps out equal areas during equal intervals of time.
#3. The speed of a planet increases as it approaches the Sun and decreases as it moves away.
Johannes Kepler was the one who found the laws by looking at the astronomical observations of Tycho Brahe. This laws proves that planets speeds varie. It also proves that planets move around the Sun, not the Sun moving around us.
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