Biting the bullet on the Laws of Planetary Motion, this morning.
There's no escaping Johannes Kepler(1571-1630) and his three laws.
In effect, it is the center of the planet going around the center of the Sun
in a quasi-circular fashion.
Law 1: Law of Orbits
Law2: Law of Areas
Law3: Law of Periods
https://commons.wikimedia.org/wiki/File:Orbit3.gif#/media/File:Orbit3.gif
http://kuffner-sternwarte.at/astronomie/sonnensystem-simulator/index.php
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