Orbital Mechanics Angles in Julia

I am starting to get more into orbital dynamics. As a result, Julia is a new programming language that is rising in adaptation. I decided to port a Python version of an orbital dynamics library into Julia. Over the next few weeks, I would like to write some explanations of what all the functions in the Python library are, how they work and write the port. Orbital dynamic angles seem like the easiest place to start.

There are some resources I have found that are very relevant and help explain some of these functions. The Kepler angles are the easiest to understand and explained at Kepler Equation

The other angles presented in the below Julia code can be explained from Session Orbits