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Vocapedia > Space > Orbits > Elliptical orbits
Video Science ABC 13 November 2020
Planetary orbits are elliptical because gravitational interaction over time changes the delicate balance of mass, velocity and distance from the star which otherwise keeps planetary orbit circular.
For a very long time, from Ptolemy to the age of Copernicus, it was widely believed and accepted that planets in our Solar System revolved in a perfectly circular path.
Because the circle was presumed to be an ideal shape for planetary bodies to orbit.
But then in the seventeenth century in his seminal book Astronomia Nova, Johannes Kepler rebutted this very idea.
He put forth his own theory pertaining to planetary motion.
He theorized that planetary bodies orbit in an elliptical path with the Sun sitting at one of the foci of that ellipse.
In this video we will try to understand what makes these planetary orbits elliptical.
YouTube https://www.youtube.com/watch?v=Rq9Wd3RiNrc
WHY Are Most CELESTIAL ORBITS ELLIPTICAL? WildAC 15 June 2018
WHY Are Most CELESTIAL ORBITS ELLIPTICAL? Video WildAC 15 June 2018
YouTube https://www.youtube.com/watch?v=dz7UWZn8aDo
elliptical orbit USA
https://www.npr.org/sections/13.7/2015/12/22/
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