Use the arrow keys to orbit the camera and W or S to zoom when the simulation canvas is focused.

Calibrating the ephemeris

Building the observable universe

CELESTIAL BODIES

SIMULATION TIME →

01 JAN 2026 · 00:00 UTC

REV FWD 30 days / sec

TERRESTRIAL PLANET

Earth

Our dynamic ocean world

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TRACKING AVAILABLE

ORBITAL PROGRESS 42.6%

PERIHELIONAPHELIONPERIHELION

DRAG ORBIT SCROLL ZOOM CLICK SELECT

FREE CAMERA

NAVIGATION

Flight controls

SPACE Pause / resume +− Change time speed O Toggle orbits L Toggle labels F Focus selected body ESC Return to overview ARROWS Orbit focused canvas WS Zoom focused canvas

Distances and body radii are visually scaled for navigation. Orbital periods, eccentricities, inclinations, and relative velocities follow astronomical data. The fixed-element model supports 1600–2400 CE.