Helian
1:1 scale solar system you can explore in the browser
About Helian
Helian is a browser-based solar system viewer that shows every planet at true scale and in its true position. It is aimed at astronomy enthusiasts, students and anyone curious about how the planets and their moons are actually arranged in space.
According to its site description, planet positions are calculated with the VSOP87 model plus a DE441 correction, landing within 0.369 arcseconds of JPL Horizons. The sky is filled with 875,291 real stars, and imagery from NASA, ESA and USGS is streamed in as the viewer zooms closer, reaching a resolution of 0.325 meters per pixel on the Moon.
What sets it apart is the emphasis on measured accuracy and real data rather than stylized illustrations. It renders with WebGL through Three.js, so it needs a browser and device with WebGL enabled to run.
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