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sidereal

A free music toy — play it in your browser, no install. A free musical observatory. Draw constellations, hear an orbit. Local Web Audio sequencer by Beibars.

by @seoshiro · seoshiro/sidereal on GitHubLANG TypeScriptHOSTED ON SEOSHIRO.GITHUB.IOUPDATED 10 Oct 2026

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Controls: On phones, orbit and transport come first; compact layers follow. Note…

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From the README

Draw a constellation. Hear an orbit.

A free musical observatory by Beibars / seoshiro. Place notes in a circular sky and hear a four-bar composition played by a clockwise orbital cursor. A working musical instrument and creative toy, built with SVG and Web Audio.

First entry opens an interactive six-step guide in its own practice sky. Play the example, choose a constellation, add a star, move it, change its duration or intensity, then save it to the practice atlas. Back, Next and Skip are available; the guide resumes after reload. How to use repeats it.

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