What is Kepler's law of orbital motion?
Kepler's first law: All planets orbit in an ellipse, with the sun at one focus.
Kepler's first law (1609): All planets orbit in an ellipse, with the sun at one focus. Note that at Perihelion (the Earth's position in January), the planet is moving the fastest, and it is moving the slowest at aphelion, which is the Earth's position in July.
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