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:



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!

Upcoming Space Birthdays Enter someone's date of birth using the form above. Next Mercury Birthdays Enter someone's date of birth using the form above. Next Venus Birthdays Enter someone's date of birth using the form above. Next Earth Birthdays Enter someone's date of birth using the form above. Next Mars Birthdays Enter someone's date of birth using the form above. Next Jupiter Birthdays Enter someone's date of birth using the form above. Next Saturn Birthdays Enter someone's date of birth using the form above. Next Uranus Birthdays Enter someone's date of birth using the form above. Next Neptune Birthdays Enter someone's date of birth using the form above.

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 301 Mercury years old on the 26th October, 2020. turns 301 Mercury years old on the 26th October, 2020. Terry Pratchett turns 118 Venus years old on the 1st December, 2020. turns 118 Venus years old on the 1st December, 2020. Terry Pratchett turns 72 Earth years old on the 28th April, 2021. turns 72 Earth years old on the 28th April, 2021. Terry Pratchett turns 39 Mars years old on the 4th September, 2021. turns 39 Mars years old on the 4th September, 2021. Terry Pratchett turns 34 Discworld years old on the 17th October, 2022. turns 34 Discworld years old on the 17th October, 2022. Terry Pratchett turns 7 Jupiter years old on the 4th May, 2031. turns 7 Jupiter years old on the 4th May, 2031. Terry Pratchett turns 1 Uranus year old on the 24th August, 2032. turns 1 Uranus year old on the 24th August, 2032. Terry Pratchett turns 3 Saturn years old on the 11th September, 2036. turns 3 Saturn years old on the 11th September, 2036. Terry Pratchett turns 1 Neptune year old on the 12th February, 2113. turns 1 Neptune year old on the 12th February, 2113.