Umbra

Geomusic played by the moons of Jupiter

Press Play. Each time a moon slips behind Jupiter, it sounds.

System what plays

Mix what you hear

Sky when it plays

anyAny night

Jupiter's moons, and five other systems held in resonance, played as music. Every passage behind a planet, across a star or through a shadow can sound; choose which.

The sky is computed for any moment from Jean Meeus's Astronomical Algorithms, from Galileo's first nights in 1610 to tonight. Each moon's pitch follows its orbital frequency; Io, Europa and Ganymede are locked 1 : 2 : 4, so they sound in octaves. Jupiter's day, 9 h 55 min, is the beat.

The history, and every view, mix and layer, explained

space play v view m mix 1–0 - layers [ ] speed e evolve r real time l listen d desk

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Umbra

Master

Time

Tuning and moons