Hohmann Transfer Example & Figure-of-8 Orbit Example

Example of Hohmann Transfer & a simulation of a Figure-of-8 Orbit around the moon.

There are two components in this group.
1. Hohmann Transfer Example: This simulation starts with a craft/satellite in low earth orbit. A Hohmann Transfer is initiated to a 'random' destination altitude. This includes the delta V to move to a higher orbit, and then circularize the orbit once the craft gets there.

2. Figure-of-8 Orbit Example:
Starting in Low Earth Orbit, the craft velocity is increased to enable it to reach the moon. The craft V is sufficient to achieve a figure-of-eight orbit - i.e. the craft does not follow an elliptical orbit with the Earth at the ellipse focus, rather it transfers between Earth and Moon Gravitation Sphere of Influences.
Cheats: The Delta V is implemented just by instantaneously applying a velocity change - no engine burns or mass changes.

This code may seem trivial, but it was a useful developmental step in understanding many other gravitational ideas.

I welcome suggestions on concept or coding technique.
Best wishes,
Stephen