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jan 1, 1609 - Kepler discovered that planets move in elliptical orbits instead of circular ones. This leads him to propose the 3 laws of planetary motion. (1618)
Added to timeline:
Astronomy
By
Pranav Grover (S)
9 months ago
0
0
57
Date:
jan 1, 1609
Now
~ 416 years ago
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