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## Main Question or Discussion Point

Hi, my name is Andreas, and I am new to this forum. I had a couple of questions regarding orbital dynamics, since I am not very familiar with the field:

Is tangential velocity in elliptical orbits stable like in circular orbits? If not, how exactly does it change? How do you calculate orbital velocity from tangential velocity? What's the mechanism that keeps elliptical orbits from dissipating?

Is tangential velocity in elliptical orbits stable like in circular orbits? If not, how exactly does it change? How do you calculate orbital velocity from tangential velocity? What's the mechanism that keeps elliptical orbits from dissipating?