Presets
Kepler's Laws
equal areas in equal times
Kepler's Third Law
far orbits, slow orbits: T²∝a³
Conic Family
one focus, four eccentricities
Hohmann Transfer
the cheapest way between orbits
Escape Trajectories
ellipse, parabola, hyperbola
Orbital Resonance
the Galilean moons' 1:2:4 lock
Kepler's Laws
Speed
1.0×
Zoom
1.00×
Trail length
1100
Orbit guides
Equal-area sectors
Focus & center
Show trails
Run
⏸ Pause
↺ Restart
GM (central mass):
1.00
Bodies:
—
Sim time:
—
—
Watch
bodies trace true Keplerian orbits
Star
sits at one focus of every ellipse — never its center
Faster
near perihelion, slower near aphelion
Toggle
guides & sectors to reveal the geometry