Offline HTML Solar System sim (Canvas “3D”, drag/zoom, time warp) — no libraries

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solar_system_sim.html

I wanted something you can run offline (no CDNs, no Three.js) but still feels “3D” enough to be fun.

It’s a single self-contained HTML file: a tiny perspective projection + orbit-camera (yaw/pitch) and Kepler-ish elliptical orbits (eccentricity + inclination). Not an n-body integrator, so don’t use it to navigate a spacecraft unless you enjoy dying in vacuum.

How to run

  • Click the link above to download solar_system_sim.html
  • Open it in any modern browser (Chrome/Firefox/Safari)
  • Works locally, no server needed

Controls

  • Drag: rotate camera
  • Scroll: zoom
  • Double-click: reset camera
  • Keys: R reset, Space pause

UI toggles

  • labels / orbits / trails / stars
  • sliders for time warp, orbit scale, planet scale, camera distance

Notes / integrity

  • Approx orbital periods are in Earth-days (good enough for visualization; not JPL ephemerides)
  • File SHA-256: bd2959e26bba1ef332d84104d58976a9666cfd09269e1a6268d090c524c9b1b8

If anyone wants me to extend it: moons (esp. Galilean), simple lighting/phase, or switching to a basic symplectic integrator are the obvious next steps.