Random Astronomy Sky Map Generator

Create a calming, seeded star chart. Private by design—everything runs locally in your browser.

Map & actions

Same seed + settings → same map.
1200 1.6 2.5

Tips: Space generate · S random seed · P download PNG.

What you’re seeing

This generator creates a random star field on a circular sky map using an orthographic projection (as if looking at a hemisphere from far away). It’s meant for ambience, mockups, and print backgrounds—not for navigation. A deterministic seed powers the randomness, so you can recreate a map exactly by reusing the same seed and settings.

  • Star count — total number of stars drawn (uniformly on the sphere).
  • Brightness — gamma curve that biases stars toward dim or bright.
  • Max size — largest star radius in pixels at the center.
  • Grid — RA rings every 15° and Declination spokes every 15° for orientation.
  • Cardinals — labels N/E/S/W around the rim.

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