Random Astronomy Sky Map Generator

What you’re seeing

This sky map generator creates a circular star map that looks like a night sky seen from a distance. It is designed for visual projects, posters, mockups, and ambient backgrounds rather than real-world navigation. The tool uses an orthographic projection, which means it displays a hemisphere of the sky as a flat circle, similar to how a globe looks when viewed straight on. The result is a clean, stylized star field that feels astronomical while remaining purely decorative.

At the heart of the generator is a repeatable random seed. A seed is just a short value that tells the generator how to place stars. If you reuse the same seed and settings, you will get the exact same star map every time. This is useful when you want to share a design, revisit a project later, or create a series of prints with matching style and layout. The randomness is controlled, so you can explore endless variations without losing consistency.

The stars are distributed across a virtual sphere, then projected into the circle. The brightness setting shapes how many stars appear dim versus bright, while the maximum size caps how large the brightest stars can be. Together, these controls let you create anything from a soft, subtle background to a bold, high-contrast star field.

1. Set the star count to control how dense the sky feels.
2. Adjust brightness to favor dim twinkles or a few bold highlights.
3. Pick a maximum star size to keep the map delicate or dramatic.
4. Choose whether to show the grid and cardinal directions.
5. Press Generate (or hit Space) and download the PNG if you like the result.

Grid lines and cardinal labels are optional, but they add a classic star chart look. The rings represent right ascension and the spokes represent declination, which are common reference lines in astronomy. You do not need to know these terms to enjoy the design, but they give the map a scientific flavor that many people associate with vintage celestial maps.

Real-world uses include custom wall art, wedding or anniversary prints, classroom visuals, book covers, and digital wallpapers. Some people use it to generate a unique “night sky” for a special date, while others simply want a clean background with a cosmic vibe. Because this generator does not pull real star positions, it avoids privacy issues and loads instantly in your browser.

• Star count — total number of stars drawn across the sphere.
• Brightness — a curve that shifts the balance between dim and bright stars.
• Max size — the largest possible star radius at the center.
• Grid — RA rings and declination spokes every 15 degrees.
• Cardinals — labels N/E/S/W around the rim.

Use this generator as a creative tool: experiment with settings, save a few favorites, and build a collection of star maps that match your project. It is an easy way to create a personalized, printable sky map without any special software.