jan 1, 1609 - Geocentric motion of Mars
Description:
After repeatedly failing to explain the motion of Mars in a circular orbit as required under Copernicanism, Kepler succeeded by assuming that the orbit was an ellipse and the Sun was located at one of the foci. A chart of geocentric motion of Mars is published in "Astronomia Nova".Added to timeline:
Date:
jan 1, 1609
Now
~ 415 years ago
