Moon phase on August 11, 2031

Last Quarter, 41%
🌗 Last Quarter
Monday, August 11, 2031 · at noon (Brasília)
Illumination: 41% Age: 23.1 days Cycle: 78%

On Monday, August 11, 2031 the Moon will be in its last quarter phase, with 41% of its disk illuminated and an age of 23.1 days since the last new moon. Half of the disk is lit again, on the opposite side from the first quarter. The Moon rises around midnight and is visible in the morning.

Moon data for this date

Moon at noon Brasília time (UTC-3)
Phase🌗 Last Quarter
Illumination41%
Moon age23.1 days
Day of the weekMonday
Last new moonJuly 19, 2031 at 10:40
Next full moonSeptember 1, 2031 at 06:21 (in 20.8 days)
Next new moonAugust 18, 2031 at 01:32 (in 6.6 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 10, 2031 August 12, 2031 →

About the last quarter

Half of the disk is lit again, on the opposite side from the first quarter. The Moon rises around midnight and is visible in the morning. The phase name comes from the Moon's position in its 29.53-day cycle: on August 11, 2031 it had completed 78% of the cycle that began with the new moon on July 19, 2031.

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 11, 2031. For sun times, check sunrise and sunset.

Frequently asked questions

What is the Moon phase on August 11, 2031?

On August 11, 2031 the Moon will be in its last quarter phase, with 41% of the disk lit (calculated at noon Brasília time).

How old is the Moon on that date?

The age is the time since the last new moon: 23.1 days of an average 29.53-day cycle.

When is the next full moon after that date?

The next full moon after August 11, 2031 falls on September 1, 2031 at 06:21 Brasília time.

When is the next new moon after that date?

The next new moon after August 11, 2031 falls on August 18, 2031 at 01:32 Brasília time.

How is the Moon phase calculated?

With Jean Meeus's astronomical formulas for the instants of new, quarter and full moon. The age comes from the time since the last new moon and the illumination is (1 − cos(2π × cycle fraction)) / 2.

Is the phase the same everywhere in the world?

Yes, the phase and the illuminated percentage are the same across the planet at any given instant. Only the orientation changes: in the southern hemisphere a waxing Moon is lit on the left, in the northern one on the right.