Orbit Playground

One planet, one rule: everything falls toward mass. Press anywhere on the field and drag out a velocity arrow — the dashed curve shows the orbit you'd get before you let go. Release to launch. Too slow and it falls back into the planet; too fast and it never comes back. A short tap gives you a perfect circle.

An interactive canvas showing satellites orbiting a planet. Your browser does not support canvas.
drag anywhere to launch · tap for a circular orbit

Readout satellite 1

elliptical
—speed km/s
—altitude km
—eccentricity
—periapsis km
—apoapsis km
—period
clock 0m 00s laps 0 in orbit 1

Launch

100% holds a circle · 141% is escape speed

→—

Controls

1 second here ≈ 33 minutes up there