Cosmic Birthday

Every special date is an excuse to celebrate, especially if it's backed by science. Have you ever wanted to celebrate your birthday on another planet? Ever wondered how old you would be on Venus or Saturn? How many moon phases have passed since your birth?

Learn the astronomy of the Solar System and share it with your friends by celebrating Cosmic Birthdays.

Celebrate your 500-week birthday or 11111-day birthday. Congratulate your friends when they turn 1 Saturn year old (that's about 29.5 years, by the way!). Or Maybe 666 full moons old?

Use this astronomical calendar to surprise your friends on their extraordinary birthdays.