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As far as I can tell this was not posted before, but this site is a trip: http://neofuel.com/index_neofuel.html

I have been working on a simulation and have got a spaceship in orbit around a planet. Now I want to present some information useful for navigation, in particular for landing on the surface. So the speed the surface moving under you is important, but for the life of me I can not figure it out or...