Pushing "up" on an orbiting body causes no change to the altitude at the other side of the orbit (that is, 180 degrees around the orbit). However, it does raise

Pushing "up" on an orbiting body causes no change to the altitude at the other side of the orbit (that is, 180 degrees around the orbit). However, it does raise the orbital altitude 90 degrees ahead, and lowers it 270 degrees ahead.