Select cities on the rotating Earth. When a pinned city passes through the terminator into daylight, it will trigger an assignable sound. Change the multiplier of the Earth's rotation to speed up or slow down the pattern.

This drum machine was inspired by the time spent watching NASA's HDEV project, the fictional Mercurian city of Terminator as imagined Kim Stanley Robinson in 2312, and my childhood love affair with Bryce3D.

City latitudes and longitudes were sourced from GeoNames. The Earth model was created from three.js by riffing on this example and stealing from Mr. Doob's reimagining. Earth textures are from Solar System Scope. The drum sounds are from me plundering random forgotten corners of my DAW.

This is part of the 10,000 Drum Machines project. Please reach out if you ever want to contribute a drum machine!