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Re:Basics of Space Flight: Orbital Mechanics by Vespasian on Wednesday October 07, 2015 @09:27AM (#10345835)
The master of KSP Scott Manley did a small series of orbital mechanics videos a while back

https://www.youtube.com/playlist?list=PLYu7z3I8tdEm-oVAzO8EH...

Re:Basics of Space Flight: Orbital Mechanics by Malic on Wednesday October 07, 2015 @10:13AM (#10346101)
...fly safe!