Does anyone know of a formula for calculating the orbital period of a station around a planet? There is a particular station that I haul to, and I'd like to know when it's going to be behind the planet so supercruise assist will stop slamming me into the planet. I'd like to be able to figure out, for example, that from 02:10:00 to 02:30:00, the station is going to be behind the planet and I'm actually going to have to pay attention to my supercruise during that period of time.