EarthOrbitSim:

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   This script simulates a spacecraft in earth orbit.
   The gravity model is the GEM-T1 model which is 36 by 36 (zonal and
   tesseral harmonics)
   All control is done through the vector aExt.
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Children:

Common: Database/Constant
Common: Graphics/Plot2D
Common: Graphics/TimeGUI
Common: Graphics/TimeLabl
Common: Math/RK4
Common: Time/Date2JD
Orbit: GravityModels/LoadGEM
SC: BasicOrbit/El2RV
SC: BasicOrbit/Period