Kepler

a circle is one note. an ellipse is a melody.

stretch an orbit and hear it — the pitch is the planet’s speed

An orbiting body moves fastest near what it orbits and slowest far away, sweeping equal areas in equal times. Mapped to pitch, that speed becomes a tone that rises and falls with the orbit itself.

Concepts: orbits, harmony.

An interactive you play with one thumb, on Wundr.