Swayanta Read the science
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You came out of this planet.
Let us remind you.

See the real sky you were born under, and where your light has travelled since.

Create a gift for someone you love. · Honour someone who is no longer here.
What you'll see

What you'll see

A journey through the real sky, made from your birthday

Enter your date of birth and Swayanta takes you through real space, built in 3D in your browser. It is not a quiz. It is closer to a short film about you, made from real astronomy and real numbers.

  1. Your life, counting

    Your heartbeats, your breaths, your seconds alive. They keep counting as you watch.

  2. The sky you were born under

    Time runs back to the day you were born, and the sky of that night opens around you in 3D: the stars, the Moon in its real phase, the constellation it was passing through, and any bright planets shining that evening or before dawn. Drag to look around. Tap the Moon, a planet or a star to learn more, like how many full moons there have been since you were born.

  3. Ride with your light

    The light from the day you were born never stopped. You ride with it past the Moon, Jupiter, Neptune and Voyager 1, then out between the stars. Every real star it has reached glows gold, and you see how old you were when it reached stars like Sirius, Vega or Altair.

The sky of one birth night in Swayanta: the Moon among the stars of Sagittarius, joined by gold lines, over the Milky Way.
A Swayanta poster: a map of someone's light, with a ring for every year of their life and the stars their light has reached.

  1. Your birthday star

    A real star about as many light-years away as you are years old. The light that left it around the year you were born is arriving at Earth now, just as your light arrives there. You can send it your light.

  2. The whole galaxy, and a poster to keep

    At the end you rise above the Milky Way, where your light is a tiny spark among hundreds of billions of suns. Then you can download a free, printable map of your light, with a ring for every year of your life.

For someone you love, or someone you miss

In memory

Enter the name, birth date and date of passing of someone who has died. Their journey is told gently, in the past tense: the seconds of their life, the full moons they saw. And their light keeps travelling.

Honour someone who is no longer here.

Real sky, real numbers

Star positions and distances come from the HYG star database. The Moon and planets are computed with the Astronomy Engine library. The Moon's surface is from NASA's Scientific Visualization Studio, and the Milky Way from ESO. Heartbeats and breaths use published averages. This is astronomy, not astrology.

It is free. There is no sign-up and no account, and nothing about you is stored: your journey is made from the date in its link.

How it works, the credits, and privacy

Questions

What did the sky look like the night I was born?

Enter your date of birth and Swayanta shows you the sky of that night in 3D: the stars, the Moon in its phase and the constellation it was in, and any bright planets shining that evening or before dawn.

Do I need my birth time or place?

No. Your date of birth is enough. The journey shows the sky of that whole night, the one everyone on Earth shared, rather than the view from one city at one hour.

What phase was the Moon on the day I was born?

Your journey shows the Moon in its real phase on your birth date, and the constellation it was passing through. Tap it to see how many full moons there have been since.

What is a birthday star?

A star about as many light-years away as you are years old. The light you see from it tonight left it around the year you were born. As you grow older, your birthday star changes.

How many times has my heart beaten?

About 100,000 times a day, according to the Cleveland Clinic, so roughly 1.1 billion times by the age of 30. Swayanta counts yours live from your birthday, using that average.

Can I make one for someone else, or for someone who has died?

Yes. You can send a journey as a gift to someone you love, made from their name and birthday. You can also make one in memory of someone who has died, from their birth date and date of passing.

Is it astrology?

No. Swayanta is real astronomy: star positions and distances from the HYG database, and the Moon and planets computed with the Astronomy Engine library. It says nothing about your character or your future.

Is it free? Do I need an account?

It is free, with no sign-up and no account. Nothing about you is stored, and the journeys people share are private pages, kept out of search engines.

Read more

Enter your date of birth.