Orbits Near a Black Hole
Close to a black hole an orbit no longer closes: each lap swings round further than the last, and near the hole the turn grows far beyond the weak-field formula.
What is and is not to scale.
How this was made and sources
One HTML file: no libraries, no network requests. Every number below was read on the date shown, from the page named next to it.
See this in the 3D mapAll simulatorsAdd your own simulatorFix a mistake on GitHub