Answer to In what frame(s) of reference are Kepler's laws valid? Are Kepler's laws purely descriptive, or do they contain.... read more
Thus, the internal frame of reference placed on heavier body without significant error. 2. The whole system of heavenly is isolated from other heavenly bodies mass. read more
Kepler’s Laws of Planetary Motion. Kepler’s First Law. The orbit of each planet about the Sun is an ellipse with the Sun at one focus. read more
However, the gigantic mass of our sun makes Kepler's laws approximately valid for most of the planets in our solar system (i.e. the (n>2)-body effects are negligible and you can get away with only consider the sun-planet interaction). read more