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!

Terry Pratchett's Birthdays

Terry Pratchett is a British fantasy author, known and loved for his incredible Discworld series. Links: Amazon, Wikipedia, Official Website, Other Celebrity Space Birthdays

 Terry Pratchett turns 73 Earth years old on the 28th April, 2021.
 Terry Pratchett turns 119 Venus years old on the 13th July, 2021.
 Terry Pratchett turns 304 Mercury years old on the 17th July, 2021.
 Terry Pratchett turns 39 Mars years old on the 4th September, 2021.
 Terry Pratchett turns 34 Discworld years old on the 17th October, 2022.
 Terry Pratchett turns 7 Jupiter years old on the 4th May, 2031.
 Terry Pratchett turns 1 Uranus year old on the 24th August, 2032.
 Terry Pratchett turns 3 Saturn years old on the 11th September, 2036.
 Terry Pratchett turns 1 Neptune year old on the 12th February, 2113.

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