Behaviours for modelling orbits authored by Maria Marinari and Ken Kahn. Here is the documentation.

• Body elements 
• Body properties 
• Count number of orbits 
• Defining the x and y of velocity 
• Defining the x, y and z of velocity
• Ellipse functions 
• Experiment reporters
• Find C.O.M
• Find total momentum
• Initialise velocity using body properties
• Orbital converter
• Plot distances
• Set my velocity
• Set plot range
• Update position
• Update velocity