A precise, interactive study of gravity and trajectories. Every figure is live. Adjust the inputs and watch the system respond.
Self-contained, interactive modules built for exploration.
Tweak velocity, eccentricity, and altitude. Watch trajectories evolve in real time.
Kepler, Newton, Hohmann, Lagrange. Explained with motion, not walls of text.
Black holes, redshift, lensing, supernovae. All interactive.