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• 14:41, 24 September 2026 Rongzhou talk contribs created page Two body problem (Created page with "In astronomy, two body problems normally refer to the study of the gravitational interaction of two celestial objects. == Classic form: planetary/satellite orbit (point mass approximation) == Approximate a star/planet as point mass $M$, and a planet/satellite orbiting around it as point mass $m$. The orbit of the planet in the reference frame of the star satisfies the equation: {{#content:Q1785}} Where $\mu=G(M+m)$. === Derivation === Let $$ \mathbf{r}=\math...")