Python Physics: Building a 3D Model for Orbital Motion 

Acabo de comprobarlo; me parece guardado. Inténtalo de nuevo y avísame si tienes algún problema.

@@DotPhysicsperfecto, ahora sí que veo el código completo. Muchas gracias por el contenido de tu canal.

Nothing special really needs to be at the point (0,0,0) for all the maths to work out correctly anyways, as long as you've written it out correctly. In this particular example code you can notice that a simplification made was the distance r in the gravity equation is equal to the ball's r, because Earth is positioned at 0. Otherwise, r would actually need to be (rSat - rEarth). This code is a simple integral propagator and you can literally code in the vectors for all the sun, planets, and moons, make sure to do all appropriate gravity equations between them all at each time step, and then accelerate them according to the totalled force, and you will get a pretty accurate solar system simulation! There are techniques with much more advanced math than this, whose advantage is basically they can use much larger time steps without becoming wildly inaccurate, than the one done here.