Create a poster of the night sky exactly as it looked from any place, on any date — free, no sign-up, nothing leaves your browser.
Pick a place, date, and time, then click Generate
Shows roughly 100 of the brightest, most recognizable stars and their constellation outlines — not a complete scientific star field, but enough to pick out Orion, the Big Dipper, and other familiar shapes.
If you're used to reading a normal map, with north at the top and east to the right, the star poster can look mirrored at first glance — east appears on the left instead. This isn't an error; it's how every real sky chart works. A ground map is drawn as if you're looking down at the Earth from above, but a sky chart shows what you see looking up and outward from inside the sky, which flips east and west relative to a bird's-eye view. It's the same reason a star chart held overhead, matched to the real sky, only lines up correctly if you orient it this way — the mirroring is what makes it match reality when you actually look up.
The place gives your coordinates on Earth; the time zone tells us how to convert the local time you enter into the correct moment in absolute time — without it, the star positions would be wrong for anywhere except the same time zone as UTC.
This shows around 100 of the brightest, most recognizable stars rather than a full scientific catalog, so very faint stars won't appear.
The underlying astronomy — converting a date, time, and location into where each star appears in the sky — uses the same standard formulas real planetarium software is built on, verified against known reference calculations for sidereal time and star position.
No. Everything is calculated and rendered locally in your browser — nothing you enter is sent to a server.
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