Rotation boost is the velocity of the launch site relative to the rotating body that it is on. The rotation boost is useful when trying to get into an orbit in the same direction as the rotation. The rotation boost is useless when trying to go into a polar orbit. In these scripts it is assumed that the spacecraft is trying to get into an orbit in the same direction as the rotation of the body. Given latitude, radius and rotation period, rotation boost is calculated which is in turn used to calculate velocity.

rotation boost = 2 * pi * cos( latitude ) * radius / rotation period

velocity = sqrt( ( rotation boost + x velocity component )^2 + y velocity component^2 )
 

This is used in astropolis, atmospheric spacecraft, multi stage spacecraft, and spacecraft cost.
 
 

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