Thanks! It's based on Figure 5.3 in this article. There are also more diagrams like it on the 17x9px flags thread and on my website. EDIT: The ones of the moons have a critical error in them which makes them wildly inaccurate. There's only the one in my signature now, but I'm working on one for our solar system. As a suggestion, you should add different point bonuses for flybys of different bodies that stack, and bonuses for landing.