Astronomia nova aitiologetos [romanized]

5. First Two Laws Kepler's work on the observations of Mars by Tycho enabled him to reach the conclusions he published here, namely that planets travel around the Sun in elliptical orbits and that their speed increases as they are nearer the Sun.
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5. First Two Laws

Kepler's work on the observations of Mars by Tycho enabled him to reach the conclusions he published here, namely that planets travel around the Sun in elliptical orbits and that their speed increases as they are nearer the Sun.

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