3- body theorem, What is the orbital geometry of the sun earth and moon
The First law of Kepler is:
Planets move along elliptical orbits with the Sun
at a focus.
So, all i can say is that the sun is relatively stagnant in our immediate universe.
The earth rotates along an elliptic orbit around the sun.
The moon rotates along an elliptic orbit around the earth.
Well, all “movements” are relative to some reference point.