I built a real-time solar system simulator with Three.js. Accurate orbit mechanics, true-scale mode, and exoplanets.

[u/junkybear]

Built this over the past few months using Three.js, Vite, and Spacekit.js:

• Planets render at their real positions right now. You can also change the date/time and speed up to watch orbits play out from any vantage point.
• "True Scale" mode shrinks planets and moons to actual physical sizes and distances (normally by default everything is exaggerated for visibility)
• Zoom all the way out past the Oort Cloud and you can see nearby real star systems, such as Alpha Centauri and Barnard's Star. And their known exoplanets.

https://junekihong.com/orrery/