My Birthday Moon
The Moon from that day, here for you now.
Tue, December 30, 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
- Tue, December 30, 2031
- Sunlit surface
- 98%
- Lunar Date
- Lunar 11/17
Share your first sky with someone close.
Moon Phase on 30 December 2031: Waning Gibbous, 98% Lit
The Moon on December 30, 2031
On December 30, 2031, the Moon will be a waning gibbous, 15.7 days old and 98% illuminated, in the constellation Gemini about 405,412 km (251,911 mi) from Earth. The next New Moon will follow on January 12, 2032.
- Phase
- Waning Gibbous
- Illumination
- 98%
- Moon age
- 15.7 days since New Moon
- Distance from Earth
- 405,412 km (251,911 mi)
- Constellation
- Gemini
- Previous Full Moon
- December 28, 2031
- Next New Moon
- January 12, 2032
- Next Full Moon
- January 27, 2032
Moon phases around December 30, 2031
| Date | Moon | Lit | Age |
|---|---|---|---|
| 12/27 Sat | Waxing Gibbous | 98% | 12.7d |
| 12/28 Sun | Full Moon | 100% | 13.7d |
| 12/29 Mon | Full Moon | 100% | 14.7d |
| 12/30 Tue | Waning Gibbous | 98% | 15.7d |
| 12/31 Wed | Waning Gibbous | 95% | 16.7d |
| 1/1 Thu | Waning Gibbous | 90% | 17.7d |
| 1/2 Fri | Waning Gibbous | 84% | 18.7d |
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.