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The solar system on your birthday

1exact sky, any date you choose

Every planet is somewhere specific on any given day — including the day you were born. Pick a date to see the exact arrangement of the solar system that day, then watch how far the light that left the Sun on your birthday has since travelled out toward the stars.

▶ Or just zoom out to the edge of everything

Choose a date:

▶ See the planets that day ✦ How far my birthday's light has reached

The exact sky, on the day you choose

This isn't an artist's impression. The planets on this site run on real orbital mathematics, so when you set a date the whole solar system winds to precisely where it was — Mercury, Earth, Jupiter, Neptune, each on its true point in its true orbit. Set it to your birthday, an anniversary, the day a child was born, and you're looking at the real arrangement of worlds overhead at that moment.

If you were born less than about four and a quarter years ago, the light that left the Sun on your birthday still hasn't reached a single other star. For the rest of us, it's out there now — already past dozens of them, and still going.

Then follow your light outward

Light leaves the Sun the instant you're born and never stops. The light horizon view takes your date and expands a shell outward at the true speed of light, ticking past real, named stars as the years accumulate — a live, growing measure of how far "your" light has carried into the galaxy. It's the same fact the whole site is built on, made personal: space is so big that even light, over a human lifetime, has barely left the neighbourhood.

Prefer the big picture? Ride the Cosmic Zoom from the solar system out to the edge of the observable universe.

Keep going

✓ Facts verified July 2026

Every figure on this page is a real, rounded value checked against primary sources. Found something out of date? See how we keep it accurate.

NASA Planetary Fact Sheet ↗NASA Science — Solar System ↗IAU ↗