Finally we have two main ingredients: drawing the boundaries of the sectors with ellipse.js and making the ellipse move with the proper velocity (ell_eq_test.js). Just need to be able to fill in the area to demonstrate Kepler's second law. It's a shame we couldn't get programmatic gravity working...
- Implementing algorithm to make ellipse move with proper speed (faster when near planetary focus, slower when away from it):
- Here's a scroll-zoom mock up of a solar system:
- And here's a time-slicer into periods:
All that remains is to put all three ideas together.