Interactive Solar System

Day 0.0

20.0 days / sec • running

Drag to pan • Scroll / pinch to zoom • Click a planet (or moon) to inspect • Space = pause • Esc = back to Solar System

Simulation

Simulation speed: 20.0 days/sec

Range 0.5 – 300 days/sec (logarithmic). Changing speed never resets positions: it only changes how fast simulation time advances.

Orbits Trails Labels

Select a body

Click a planet in the 3D view or use these buttons. Selecting shows details; “Focus planet” switches to the selected-planet view.

Inspector

Nothing selected. Click any planet, the Moon, a Galilean moon, or the Sun.

How it works

One clock drives everything: simDays += dt × daysPerSecond. Each orbit angle is a pure function of simDays: angle = phase + 2π × simDays / periodDays. A moon's world position is planetPos(simDays) + moonOffset(simDays), so moons keep orbiting correctly while their planet travels, and moving the speed slider never jumps or loses orbital state.

Periods are real relative values (Earth 365.25 d, Jupiter 4332.6 d, Io 1.77 d, …). Sizes and distances are compressed for visibility and are not to scale.