Moon phase on September 28, 2025

First Quarter, 43%
🌓 First Quarter
Sunday, September 28, 2025 · at noon (Brasília)
Illumination: 43% Age: 6.8 days Cycle: 23%

On Sunday, September 28, 2025 the Moon was in its first quarter phase, with 43% of its disk illuminated and an age of 6.8 days since the last new moon. Half of the disk is lit, about a week after the new moon. The Moon is easy to see in the early evening and sets around midnight.

Moon data for this date

Moon at noon Brasília time (UTC-3)
Phase🌓 First Quarter
Illumination43%
Moon age6.8 days
Day of the weekSunday
Last new moonSeptember 21, 2025 at 16:54
Next full moonOctober 7, 2025 at 00:47 (in 8.5 days)
Next new moonOctober 21, 2025 at 09:25 (in 22.9 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 27, 2025 September 29, 2025 →

About the first quarter

Half of the disk is lit, about a week after the new moon. The Moon is easy to see in the early evening and sets around midnight. The phase name comes from the Moon's position in its 29.53-day cycle: on September 28, 2025 it had completed 23% of the cycle that began with the new moon on September 21, 2025.

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 28, 2025. For sun times, check sunrise and sunset.

Frequently asked questions

What is the Moon phase on September 28, 2025?

On September 28, 2025 the Moon was in its first quarter phase, with 43% 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: 6.8 days of an average 29.53-day cycle.

When is the next full moon after that date?

The next full moon after September 28, 2025 falls on October 7, 2025 at 00:47 Brasília time.

When is the next new moon after that date?

The next new moon after September 28, 2025 falls on October 21, 2025 at 09:25 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.