Moon phase on September 23, 2024

Waning Gibbous, 68%
🌖 Waning Gibbous
Monday, September 23, 2024 · at noon (Brasília)
Illumination: 68% Age: 20.5 days Cycle: 69%

On Monday, September 23, 2024 the Moon was in its waning gibbous phase, with 68% of its disk illuminated and an age of 20.5 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

Moon at noon Brasília time (UTC-3)
Phase🌖 Waning Gibbous
Illumination68%
Moon age20.5 days
Day of the weekMonday
Last new moonSeptember 2, 2024 at 22:56
Next full moonOctober 17, 2024 at 08:27 (in 23.9 days)
Next new moonOctober 2, 2024 at 15:50 (in 9.2 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 22, 2024 September 24, 2024 →

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 September 23, 2024 it had completed 69% of the cycle that began with the new moon on September 2, 2024.

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 23, 2024. For sun times, check sunrise and sunset.

Frequently asked questions

What is the Moon phase on September 23, 2024?

On September 23, 2024 the Moon was in its waning gibbous phase, with 68% 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: 20.5 days of an average 29.53-day cycle.

When is the next full moon after that date?

The next full moon after September 23, 2024 falls on October 17, 2024 at 08:27 Brasília time.

When is the next new moon after that date?

The next new moon after September 23, 2024 falls on October 2, 2024 at 15:50 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.