- Nicolaus Copernicus proposed the heliocentric model where planets orbit the Sun, but he assumed the orbits were perfect circles. - Galileo Galilei provided telescopic observations that supported the heliocentric model but did not discover elliptical orbits. - Johannes Kepler, using the detailed astronomical data collected by Tycho Brahe, formulated his three laws of planetary motion between 1609 and 1619. - Kepler's First Law states that the orbit of a planet is an ellipse with the Sun at one of the two foci.
The fact that the planets move around the Sun, not in circles but in ellipses, was first demonstrated by
Asked in UPSC CDS 1 2017 · Topic: Scientists & Inventions (Galileo's Contributions to Kinematics and Astronomy (Telescope))
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