I'm currently running a tour of the Outer Planets mod. My mothership doesn't have enough delta-v to make it out there all in one go, so I'm planet hopping, refueling the craft along the way. This has worked okay so far, and I'm currently en-route to Vall. The next step after my pit stop in the Jool system is transferring out to Sarnus, where I will top up the tanks again at Eeloo. Only thing is, I can't figure out the Jool --> Sarnus transfer window. Is there any way to calculate this?