On Thursday, January 31, 1991 the Moon was in its full moon phase, with 99% of its disk illuminated and an age of 15.6 days since the last new moon. The whole disk is lit: the Moon rises as the Sun sets and stays up all night. It is the brightest and most photographed phase.
Moon data for this date
| Phase | 🌕 Full Moon |
|---|---|
| Illumination | 99% |
| Moon age | 15.6 days |
| Day of the week | Thursday |
| Last new moon | January 15, 1991 at 21:50 |
| Next full moon | February 28, 1991 at 15:25 (in 28.2 days) |
| Next new moon | February 14, 1991 at 15:32 (in 14.1 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.
← January 30, 1991 February 1, 1991 →
About the full moon
The whole disk is lit: the Moon rises as the Sun sets and stays up all night. It is the brightest and most photographed phase. The phase name comes from the Moon's position in its 29.53-day cycle: on January 31, 1991 it had completed 52% of the cycle that began with the new moon on January 15, 1991.
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 January 31, 1991. For sun times, check sunrise and sunset.