Allow central bodies which have another primary than the Sun

[gomezzz]

Feature

Desired Behavior / Functionality

Allowing other central bodies such as the Moon.

What Needs to Be Done

Right now, we convert to heliocentric coordinates to compute eclipses using pykep.

This conversion needs to be specified in some way if the body's motion around the sun is not implicitly modelled via pykep.

Atm, the conversion to heliocentric happens in the code at

PASEOS/paseos/central_body/central_body.py

Line 162 in fca6c4b

if reference_frame == ReferenceFrame.Heliocentric:

How Can It Be Tested

Create a lunar scenario ✌️