1. The problem statement, all variables and given/known data So, if the Earth stopped moving(supposing Earth's orbit is a circle) how much time would it have to pass before it hit the Sun? 2. Relevant equations I've tried with Kepler, and Newton's derivations of Kepler's 3th law 3. The attempt at a solution Well I'm pretty sure you need to get 64.56 days, but I'm having a few difficulties with the process of getting there. Also, I'm in a bit of a rush. So if anyone can help I'll be forever in your debt.