2d orbital simulator. Spaceships don't just float in space. They are always falling towards Earth but just keep on missing it. Use space bar to thrust forward and L-arrow and R-arrow to rotate your ship (rotational stabilizers are always enabled). Free fall is tracked with the pen function. If you are having trouble getting into orbit burn tangential to Earth (in the direction of travel "prograde" to increase your orbit and against the direction of travel "retrograde' to decrease it).
Uses positive x from the origin as and counterclockwise as positive. The I and IV quadrants (x>0) require negative of the sin and cos components of velocity. There is a bug where velocity jumps from 0 to 0.4 on some launches after the first one.
