My Birthday Moon
The Moon from that day, here for you now.
Sun, October 5, 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
- Sun, October 5, 2031
- Sunlit surface
- 80%
- Lunar Date
- Lunar 8/19
Share your first sky with someone close.
Moon Phase on 5 October 2031: Waning Gibbous, 80% Lit
The Moon on October 5, 2031
On October 5, 2031, the Moon will be a waning gibbous, 18.3 days old and 80% illuminated, in the constellation Taurus about 393,967 km (244,800 mi) from Earth. The next New Moon will follow on October 16, 2031.
- Phase
- Waning Gibbous
- Illumination
- 80%
- Moon age
- 18.3 days since New Moon
- Distance from Earth
- 393,967 km (244,800 mi)
- Constellation
- Taurus
- Previous Full Moon
- September 30, 2031
- Next New Moon
- October 16, 2031
- Next Full Moon
- October 30, 2031
Moon phases around October 5, 2031
| Date | Moon | Lit | Age |
|---|---|---|---|
| 10/2 Thu | Waning Gibbous | 98% | 15.3d |
| 10/3 Fri | Waning Gibbous | 94% | 16.3d |
| 10/4 Sat | Waning Gibbous | 88% | 17.3d |
| 10/5 Sun | Waning Gibbous | 80% | 18.3d |
| 10/6 Mon | Waning Gibbous | 72% | 19.3d |
| 10/7 Tue | Waning Gibbous | 63% | 20.3d |
| 10/8 Wed | Waning Gibbous | 53% | 21.3d |
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.