Space Birthday

Do you know how many Mars years old you are?


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:
You need to enter the year correctly - your Jupiter birthday doesn't fall on the same day each year, in fact most years you don't even have one!

Johannes Kepler's Birthdays

Kepler made very careful observations of the planets, and discovered Kepler's laws of planetary motion, which helped Isaac Newton develop his theory of gravity. Links: Wikipedia, Other Celebrity Space Birthdays

 Johannes Kepler turns 1879 Mercury years old on the 18th July, 2024.
 Johannes Kepler turns 736 Venus years old on the 12th October, 2024.
 Johannes Kepler turns 453 Earth years old on the 27th December, 2024.
 Johannes Kepler turns 241 Mars years old on the 10th April, 2025.
 Johannes Kepler turns 39 Jupiter years old on the 3rd July, 2034.
 Johannes Kepler turns 16 Saturn years old on the 24th April, 2043.
 Johannes Kepler turns 3 Neptune years old on the 15th May, 2066.
 Johannes Kepler turns 6 Uranus years old on the 7th December, 2077.