The night sky on your birthday, as a star map you can print
What did the sky look like on the night you were born, on your wedding day or at the moment a child arrived? This night sky on my birthday tool draws the stars exactly as they stood over any place on Earth at any date and time from 1800 to 2200, and lays them out as a keepsake poster with your headline, a short message, the place, the date and the coordinates.
It is a free custom star map generator: choose one of five themes, A4 or US Letter paper, constellation lines, names and the Moon and planets, then download a 300 dpi PNG, a print-ready PDF, or print it straight from the browser. The stars come from the same catalogue and projection as the interactive star chart, so the map is real astronomy, not decoration.
How to use the Night Sky on My Birthday
- Choose the City (or type the Latitude and Longitude) and check the Time zone — use the zone of the place on that date.
- Enter the Date and Time. If you do not know the time of birth, 22:00 gives a typical night sky.
- Write a Headline and an optional Message; the place line uses the city name unless you type your own Place text.
- Pick a Theme and Paper size and switch lines, names, Moon and planets, altitude rings or coordinates on or off.
- Press Download PNG or Download PDF, or Print on your own printer.
Night Sky on My Birthday features
Real sky for any moment
Around 530 bright stars and 67 constellation figures, the Moon with its actual phase, and Mercury to Saturn, computed for the minute and place you choose.
Five tasteful themes
Midnight gold, black and white, a printer-friendly paper theme, deep teal and plum and blush — all text meets the 4.5:1 contrast guideline.
Print-ready output
300 dpi PNG (2480 × 3508 px on A4, 2550 × 3300 px on Letter) and a PDF at the exact page size.
Any language on the poster
Text is drawn into the image, so names in Hindi, Tamil, Arabic or Chinese print exactly as typed.
Private
Everything runs in your browser; your date, place and message are never uploaded.
How the star map is made
For the date, time and place you enter, the tool converts each star’s catalogue position into altitude and azimuth using the local sidereal time, then draws the visible half of the sky as a circle: the centre is the point straight overhead, the rim is the horizon. North is at the top and east on the left, because a sky map is meant to be held above your head — exactly like the star chart and a planisphere. Star sizes follow brightness, from Sirius down to stars of magnitude 5, about the faintest you can see from a dark suburb.
The Moon is drawn with the phase it really had, lit on the side facing the Sun, and the planets with their own colours. If the time you choose is in daylight, the poster still shows the stars that were above the horizon, and the note under the preview says the Sun was up.
Getting the time and place right
- Use the local clock time of the place, and its time zone: the browser applies the daylight-saving rules that were in force on that date.
- A few minutes do not matter — the sky turns about 1° every four minutes — but a wrong time zone shifts the whole map by hours.
- The same sky returns to the same place every year about four minutes earlier per day, so a birthday sky at 22:00 looks almost the same each year; only the Moon and planets differ.
- For a sky that also shows the planets’ rise and set times, see planets visible tonight; for the Moon on that date, the moon phase calculator.
Printing tips
| Goal | Settings |
|---|---|
| Frame on the wall | Midnight gold or deep teal, A4 or Letter PDF, matte photo paper |
| Home inkjet or laser | Paper theme — dark stars on a light background save ink |
| Share on a phone | PNG in any theme; it is sharp enough to zoom |
| Larger poster | Send the 300 dpi PNG to a print shop; it scales well to A3 |
Night Sky on My Birthday FAQ
Can I see what the stars looked like on my birthday?
Yes. Enter the place, the date and the time, and the map shows every star above the horizon at that moment, with the Moon and planets in their real positions.
How accurate is the star map?
For dates near the present, stars are placed to about 0.1° and the Moon and planets to a few arcminutes — finer than a poster can show. The catalogue is for the year 2000 and precession is not applied, so for 1800 or 2200 the whole pattern is turned by up to about 3°; the shapes of the constellations do not change.
Is this custom star map generator free?
Yes — no sign-up and no watermark. Download the PNG or PDF and print as many copies as you like.
Why is east on the left?
Because the poster shows the sky overhead, seen from below. Hold it above your head with N towards north and every star lines up.
What if I do not know the time?
Pick 22:00 for an evening sky or 00:00 for midnight. The constellations shift through the night, but the Moon and planets stay roughly in place for hours.
Can I write the message in my own language?
Yes. Every line of text is drawn into the image, so any script your device can display appears in the PNG and the PDF.