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Re:An Inside Look at Microsoft’s Newest Flight Simulator by bbojan on Monday October 07, 2019 @08:09AM (#21179824)
Orbiter. It's free, too.

http://orbit.medphys.ucl.ac.uk/

Re:An Inside Look at Microsoft’s Newest Flight Simulator by canthonytucci on Monday October 07, 2019 @11:28AM (#21181986)
Many great videos on YouTube showing just how flight simulatorish orbiter really is.

You spend a lot of time figuring out how to time burns to manage your orbit.