Physics, computed.
A reference library of gravity calculators. Pick a phenomenon — time dilation, event horizons, orbital mechanics — and watch the math run on the masses, speeds, and distances that interest you. Built for people who want their physics live, not in a textbook.
Each calculator is named for the person whose work it computes. Lorentz for the transformations behind time dilation. Schwarzschild for the first exact solution to Einstein's field equations. Kepler for the laws of orbital motion. The point isn't worship — it's traceability. You can read the original papers.
Textbooks present gravity statically. These calculators let you play with the numbers — what happens if Earth collapsed to a black hole, how long until a 1g rocket reaches Andromeda, what's the orbital period of a planet around Sagittarius A*. The math is interactive, the physics is canonical, the citations are real.