This is a series of tutorials inspired by the course “CFD Python: 12 steps to Navier-Stokes”. The goal is to teach beginners how to write fast and clean N-body gravity simulations code in Python.
And, making a digression at this stage on the subject of light, I expounded at considerable length what the nature of that light must be which is found in the sun and the stars, and how thence in an instant of time it traverses the immense spaces of the heavens, and how from the planets and comets it is reflected towards the earth.