By Michael Hartley
If you were born on Mars, how old would you be today? Or how many times has Jupiter gone around the sun since you were born? What's your age in Venusian years? This page can tell you! Enter your and your friends' birthdays using the form below. The information will only be stored on this computer, not on the server, so don't worry! (PS - I also have some printable space birthday worksheets you can download if you want to do these calculations yourself.)
- Your/your friend's name:
- Your/your friend's birthday:
Celebrity Birthdays
Galileo Galilei turns 750 Venus years old on the 13th July, 2025. Galileo brought astronomy many leaps forward with his discoveries, including the discovery of the moons of Jupiter. Links: Amazon, Wikipedia, Other Space Birthdays For Galileo Galilei 
Douglas Adams turns 39 Mars years old on the 18th July, 2025. Douglas Adams wrote the famous Hitch Hiker "trilogy", in which the unfortunate Arthur Dent bounces through space and time like a billiard ball.. Links: Amazon, Wikipedia, Official Website, Other Space Birthdays For Douglas Adams J. R. R. Tolkien turns 71 Mars years old on the 19th July, 2025. J. R. R. Tolkien was a linguist, who wrote the Hobbit for his children. It became so popular he wrote a sequel, Lord Of The Rings, and other novels.. Links: Amazon, Wikipedia, Other Space Birthdays For J. R. R. Tolkien 
J. K. Rowling turns 249 Mercury years old on the 20th July, 2025. J. K. Rowling became famous for her Harry Potter series of books, after being rejected by eight different publishers. Links: Amazon, Wikipedia, Official Website, Other Space Birthdays For J. K. Rowling 
Robin Williams turns 74 Earth years old on the 21st July, 2025. Robin Williams was a well-loved comedian and film actor, who started his rise to fame as the alien Mork in Mork and Mindy. Links: Amazon, Wikipedia, Other Space Birthdays For Robin Williams William Herschel turns 466 Venus years old on the 24th July, 2025. William Herschel was an astronomer who discovered the planet Uranus, the first new planet discovered since ancient times.. Links: Amazon, Wikipedia, Other Space Birthdays For William Herschel J. K. Rowling turns 60 Earth years old on the 31st July, 2025. J. K. Rowling became famous for her Harry Potter series of books, after being rejected by eight different publishers. Links: Amazon, Wikipedia, Official Website, Other Space Birthdays For J. K. Rowling Neil Armstrong turns 95 Earth years old on the 5th August, 2025. Neil Armstrong was the first human being to set foot on the moon. Links: Amazon, Wikipedia, NASA, Other Space Birthdays For Neil Armstrong 
George Takei turns 3 Saturn years old on the 23rd August, 2025. George Takei played helmsman Lieutenant Sulu in the original Star Trek series. Links: Amazon, Wikipedia, Facebook, Other Space Birthdays For George Takei Isaac Newton turns 13 Saturn years old on the 22nd October, 2025. Isaac Newton, amongst many other discoveries, developed a theory of gravity that helped explain how the planets move in their orbits. Links: Wikipedia, Other Space Birthdays For Isaac Newton