My Birthday Moon
The Moon from that day, here for you now.
Sat, May 17, 2031
Waning Crescent
A slender light before the new Moon. Between one ending and the next beginning.
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, May 17, 2031
- Sunlit surface
- 17%
- Lunar Date
- Lunar Leap 3/26
Share your first sky with someone close.
Moon Phase on 17 May 2031: Waning Crescent, 17% Lit
The Moon on May 17, 2031
On May 17, 2031, the Moon will be a waning crescent, 25.4 days old and 17% illuminated, in the constellation Pisces about 386,728 km (240,302 mi) from Earth. The next New Moon will follow on May 21, 2031.
- Phase
- Waning Crescent
- Illumination
- 17%
- Moon age
- 25.4 days since New Moon
- Distance from Earth
- 386,728 km (240,302 mi)
- Constellation
- Pisces
- Previous Full Moon
- May 7, 2031
- Next New Moon
- May 21, 2031
- Next Full Moon
- June 5, 2031
Moon phases around May 17, 2031
| Date | Moon | Lit | Age |
|---|---|---|---|
| 5/14 Wed | Waning Crescent | 46% | 22.4d |
| 5/15 Thu | Waning Crescent | 36% | 23.4d |
| 5/16 Fri | Waning Crescent | 26% | 24.4d |
| 5/17 Sat | Waning Crescent | 17% | 25.4d |
| 5/18 Sun | Waning Crescent | 10% | 26.4d |
| 5/19 Mon | Waning Crescent | 5% | 27.4d |
| 5/20 Tue | Waning Crescent | 1% | 28.4d |
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.