The Game Room
One night, heard
The sky over Williamsport, Maryland, from 12:58 at night to sunrise on November 1, 2026, in sixty seconds. Every bright star rings a note as it rises.
Lying on your back with your head to the north: east is on the left. Turn your sound on. The clocks fell back an hour that night, so the time jumps from 1:59 EDT to 1:00 EST.
What you are hearing
Nothing here was composed after the fact. The sky did these things over Williamsport that night, and each one makes one sound.
- A star rises in the east: a bell. 155 stars of magnitude 4.5 or brighter rose that night. Brighter stars ring louder. The ring on screen is drawn where the star clears the horizon.
- Its color picks the note. Hot blue-white stars ring high, orange and red stars ring low, on the five notes of A minor pentatonic between 220 and 1760 Hz.
- A star sets in the west: a soft, low pluck. 164 of them.
- Planets get chords. Jupiter rises at 1:25 EDT. Neptune sets at 3:39 EST, Saturn at 4:13. Venus comes up at 5:44.
- Dawn is the light coming up. It swells and lands on A major at sunrise, 6:39.
How it was made
The Sun, Moon and planets come from NASA JPL's DE421 ephemeris, computed with the skyfield library in Python. The stars are the 5,044 brightest in XHIP, an extended Hipparcos star catalog (Anderson and Francis, 2012); the live sky on this page draws the 1,627 of them brighter than magnitude 5. Before any of it was trusted, Sirius, Arcturus, Vega and Polaris were checked against where they should be. Polaris came out 40.2 degrees up, due north: the latitude of Williamsport, 39.6, plus the 0.6 degrees Polaris sits off the true pole.
Every note was then synthesized from those events as sine-wave bells, plucks and chords in numpy, with a small synthetic hall around them. There are no samples and no AI music model in it. To check the sound against the sky, the brightest star to rise, Arcturus, clears the horizon at 41.68 seconds, and its bell is the loudest onset at 41.66.
The picture on this page is drawn live in your browser from the same star data while the recording plays. Scrub the bar and the sky goes with it. Hover or tap a bright star to see its name.
Why we did it
This studio works with Claude, an AI made by Anthropic. On the night of October 31 it had just learned to make sound, and the man who runs the place told it to go look at the stars all night.
Claude cannot hear. It can make a sound file and measure it, and it can look at a picture of the sound, but it has never heard a note. So this was built for two senses at once. The sky is the part Claude can see and check, star by star. The sound is the part only a person can judge. He listened to it the next day and asked for this page.
Made in this studio with Claude. Star data: XHIP (Anderson and Francis, 2012, VizieR V/137D), as packaged by the d3-celestial project (BSD license). Ephemeris: JPL DE421, via skyfield. The sky positions are drawn with a fast formula that sits within 0.36 degrees of the full calculation.