Space Simulator  1.0.9
space flight simulator
Free Return Trajectory

In Apollo 8, 10 and 11 the Earth-Moon free return trajectory was used as a backup method for returning the crew back to Earth.

Using the orbit predictor, we can easily visualize how the free return trajectory is played out. Your trans-lunar injection path will often take the shape of the path in the left image. Decreasing delta-v will wrap the path around the Earth.

FreeReturnTrajectory.png