On Monday, August 21, 1989 the Moon was in its waning gibbous phase, with 73% of its disk illuminated and an age of 20.0 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 | 73% |
| Moon age | 20.0 days |
| Day of the week | Monday |
| Last new moon | August 1, 1989 at 13:06 |
| Next full moon | September 15, 1989 at 08:50 (in 24.9 days) |
| Next new moon | August 31, 1989 at 02:45 (in 9.6 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 20, 1989 August 22, 1989 →
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 21, 1989 it had completed 67% of the cycle that began with the new moon on August 1, 1989.
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 21, 1989. For sun times, check sunrise and sunset.