On Tuesday, August 31, 1999 the Moon was in its waning gibbous phase, with 70% of its disk illuminated and an age of 20.2 days since the last new moon. The lit part starts to shrink. The Moon rises a few hours after dusk and is still in the sky when day breaks.
Moon data for this date
| Phase | 🌖 Waning Gibbous |
|---|---|
| Illumination | 70% |
| Moon age | 20.2 days |
| Day of the week | Tuesday |
| Last new moon | August 11, 1999 at 08:08 |
| Next full moon | September 25, 1999 at 07:51 (in 24.8 days) |
| Next new moon | September 9, 1999 at 19:02 (in 9.3 days) |
The Moon on the surrounding days
Compare the phase and illumination over the three days before and after. Click a day to open its page.
← August 30, 1999 September 1, 1999 →
About the waning gibbous
The lit part starts to shrink. The Moon rises a few hours after dusk and is still in the sky when day breaks. The phase name comes from the Moon's position in its 29.53-day cycle: on August 31, 1999 it had completed 68% of the cycle that began with the new moon on August 11, 1999.
Looking for another date, such as a birthday? Use the Moon phase on the day I was born tool, see the Moon phase today page with the lunar calendar, or find the day of the week of August 31, 1999. For sun times, check sunrise and sunset.