Kepler’s First Law of Motion – Elliptical Orbits (Astronomy)

With his first law of planetary motion, Kepler rejected circular orbits and showed that an ellipse could better explain the observed motions of Mars. Generalized to all planets, it states that the orbit of a planet follows an ellipse with the Sun at one focus.

We have videos for all 3 laws!
Kepler’s 1st Law:
Kepler’s 2nd Law:
Kepler’s 3rd Law:

We highly recommend the Astronomy textbook “Universe” by Roger Freedman et al:
Universe 9th Edition
Universe 10th Edition

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Presented by Liliana de Castro
Written by Meg Rosenburg
Produced by Kimberly Hatch Harrison & Michael Harrison