What was the Moon on your birthday?
Enter any date from 1900 to 2100. You’ll see the Moon’s exact phase that night, how much of it was lit and how old it was.
Questions
What moon was I born under?
Enter your birthday above — it shows the phase (for example “waxing gibbous, 82% lit”) for that night.
Is this the same as NASA’s moon phase data?
It uses astronomy-engine, which is checked against NASA JPL ephemerides; results match to well under an hour.
Does the time of day matter?
Only slightly — the Moon’s phase changes gradually over a day. We use 9 pm.
More free sky tools
- What moon were you born under?
- Which constellation was the Sun really in on your birthday?
- Which planets can you see tonight?
- Full moon calendar 2026–2027
- When is the next full moon on Halloween?
- The Moon on Halloween 2026
- The Moon on Halloween 2027
- The Moon on Thanksgiving 2026
- The Moon on Christmas 2026
- The Moon on New Year’s Eve 2026
- The Moon on Valentine’s Day 2027