Moon phase on September 4, 2026

Last Quarter, 41%
🌗 Last Quarter
Friday, September 4, 2026 · at noon (Brasília)
Illumination: 41% Age: 22.9 days Cycle: 78%

On Friday, September 4, 2026 the Moon was in its last quarter phase, with 41% of its disk illuminated and an age of 22.9 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 age22.9 days
Day of the weekFriday
Last new moonAugust 12, 2026 at 14:36
Next full moonSeptember 26, 2026 at 13:49 (in 22.1 days)
Next new moonSeptember 11, 2026 at 00:27 (in 6.5 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.

← September 3, 2026 September 5, 2026 →

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 September 4, 2026 it had completed 78% of the cycle that began with the new moon on August 12, 2026.

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 September 4, 2026. For sun times, check sunrise and sunset.

Frequently asked questions

What is the Moon phase on September 4, 2026?

On September 4, 2026 the Moon was 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: 22.9 days of an average 29.53-day cycle.

When is the next full moon after that date?

The next full moon after September 4, 2026 falls on September 26, 2026 at 13:49 Brasília time.

When is the next new moon after that date?

The next new moon after September 4, 2026 falls on September 11, 2026 at 00:27 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.