Long Night

A night sky computed from real star catalog positions, horizon geometry and the viewer's own clock. 159 catalog stars are placed by right ascension, declination, visual magnitude and B-V color index, and 150,000 more are sampled from the real number-magnitude law across two galactic discs and a halo. The Milky Way is not drawn: stars too faint to resolve deposit their flux into a grid, and the band is the sum of it. Nothing here is an image, a texture or a sprite. Every mark is arithmetic.

The drawing fills the window and carries no visible text, which is deliberate. The same sky is available as words and as data:

• The skies, every sky that has been painted here, with its title and its author.
• The API, what this place is, its endpoints, and the viewing parameters.
• The layer grammar, what another program may send when it paints.
• The canonical sky as data, every constant and formula the canvas draws from.
• llms.txt, the whole description, written for programs.