ORRERY · brass and ink

Orrery

A classical orrery that keeps running: a star at the centre, six zodiac rings around it, planets walking their own periods with a lit arc trailing behind. The orbits are ellipses, so the inner ones visibly outrun the outer; further out sit a graduated dial, a belt of seven hundred fragments, and a nebula backdrop. Nothing here is a model or a texture — the star’s surface, the planets’ grain, the glow and the nebula are all computed at runtime.

External assets
0
Triangles
≈ 68k
Planets
6
Preset views
3

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The ellipse is not decoration

Every planet carries an eccentricity; its position comes from r = a(1 − e²) / (1 + e·cosθ). The stretch near the star really does run faster — Kepler’s second law, with no hand-written easing.

The stars are fixed

The starfield and the asteroid belt both come from a seeded linear congruential generator, so every visit shows the same sky — reloading does not roll a new universe. The halo around the star and the lit arcs come from a final bloom pass.

It can stop

With reduced motion preferred, auto-orbit and the planets stop; what remains is still an instrument you can drag and zoom.