Not the constellations — those barely move in a lifetime. The things that were actually somewhere that night: the Moon’s phase and how much of it was lit, the Sun sign it fell in, and the Mayan day sign the date landed on. Enter a birth date. Free, no sign-up, nothing stored.
Date of birth
The result is date-only — safe to bookmark, safe to send to whoever you were born near.
The constellations look essentially the same on every birthday in living memory — a star map of your birth night and one of tonight are near-identical pictures with different captions. What genuinely differed that night was the Moon: its phase runs a full cycle every 29.5 days, so it is the one thing overhead that marks your date out from the one before it. Add the Sun’s position and the day’s place in the 260-day Mayan count and you have a signature the date actually owns.
Everything here is computed with the Swiss Ephemeris and the authentic GMT correlation — the same math an observatory and a Maya day-keeper would use. Read the method → Curious about the Mayan side? Try the Tzolk’in calculator →
If you want it on a wall, the honest version draws both: the real stars over that place and the things that actually moved — the planets at their measured degrees, the Moon’s phase, the degree rising on the horizon. See the Star Portrait →