Here is how to build a model of the orbiting ISS in python (WebVPython) using a numerical calculation (Euler method).
Here is the code:
https://trinket.io/glowscript/2feccf9892
Here is my derivation of orbital motion:
• Orbital Motion and Centripetal Acceleration
00:00 - Intro
02:36 - Creating a numerical calculation
07:15 - ISS Data and Stuff
08:08 - Coding in python
19:14 - Setting initial velocity for circular orbit