My Birthday Moon
The Moon from that day, here for you now.
Sat, April 12, 2031
Waning Gibbous
A Moon just past its fullness. Its shadow was slowly growing again.
Time has passed. The shape of that day’s Moon can still be found.
Phase and illumination use noon in Korea (KST) on the selected date. They do not represent the Moon’s exact position at your birth time and place.
A small record of that day
- Date
- Sat, April 12, 2031
- Sunlit surface
- 77%
- Lunar Date
- Lunar 3/21
Share your first sky with someone close.
Moon Phase on 12 April 2031: Waning Gibbous, 77% Lit
The Moon on April 12, 2031
On April 12, 2031, the Moon will be a waning gibbous, 20.0 days old and 77% illuminated, in the constellation Ophiuchus about 368,041 km (228,690 mi) from Earth. The next New Moon will follow on April 21, 2031.
- Phase
- Waning Gibbous
- Illumination
- 77%
- Moon age
- 20.0 days since New Moon
- Distance from Earth
- 368,041 km (228,690 mi)
- Constellation
- Ophiuchus
- Previous Full Moon
- April 7, 2031
- Next New Moon
- April 21, 2031
- Next Full Moon
- May 7, 2031
Moon phases around April 12, 2031
| Date | Moon | Lit | Age |
|---|---|---|---|
| 4/9 Wed | Waning Gibbous | 97% | 17.0d |
| 4/10 Thu | Waning Gibbous | 93% | 18.0d |
| 4/11 Fri | Waning Gibbous | 86% | 19.0d |
| 4/12 Sat | Waning Gibbous | 77% | 20.0d |
| 4/13 Sun | Waning Gibbous | 66% | 21.0d |
| 4/14 Mon | Waning Gibbous | 55% | 22.0d |
| 4/15 Tue | Waning Crescent | 43% | 23.0d |
Values are calculated with Astronomy Engine at 12:00 Korea Standard Time (03:00 UTC) on each date; New and Full Moon dates are in UTC. Moon age counts days since the New Moon; distance is centre to centre.
How to find the Moon on your birthday
- Choose your birth year, month and day, then show your Moon.
- Read the phase name and illuminated percentage. A Full Moon appears almost completely lit; a crescent shows a smaller sunlit portion.
- Select “Share this Moon” to create an image card for that date.
Does birth time or location change the result?
This date-only calculator uses Astronomy Engine at noon Korea Standard Time (03:00 UTC) on the selected date. It does not calculate the exact sky at your birth time or birthplace. Near a phase transition, a different time on the same date can give a different phase or illumination.