Moon phase on September 16, 2021

Waxing Gibbous, 73%
🌔 Waxing Gibbous
Thursday, September 16, 2021 · at noon (Brasília)
Illumination: 73% Age: 9.6 days Cycle: 33%

On Thursday, September 16, 2021 the Moon was in its waxing gibbous phase, with 73% of its disk illuminated and an age of 9.6 days since the last new moon. More than half of the disk is lit and the Moon already shows up in the afternoon. It stays visible most of the night, until the small hours.

Moon data for this date

Moon at noon Brasília time (UTC-3)
Phase🌔 Waxing Gibbous
Illumination73%
Moon age9.6 days
Day of the weekThursday
Last new moonSeptember 6, 2021 at 21:52
Next full moonSeptember 20, 2021 at 20:55 (in 4.4 days)
Next new moonOctober 6, 2021 at 08:05 (in 19.8 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 15, 2021 September 17, 2021 →

About the waxing gibbous

More than half of the disk is lit and the Moon already shows up in the afternoon. It stays visible most of the night, until the small hours. The phase name comes from the Moon's position in its 29.53-day cycle: on September 16, 2021 it had completed 33% of the cycle that began with the new moon on September 6, 2021.

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 16, 2021. For sun times, check sunrise and sunset.

Frequently asked questions

What is the Moon phase on September 16, 2021?

On September 16, 2021 the Moon was in its waxing gibbous phase, with 73% 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: 9.6 days of an average 29.53-day cycle.

When is the next full moon after that date?

The next full moon after September 16, 2021 falls on September 20, 2021 at 20:55 Brasília time.

When is the next new moon after that date?

The next new moon after September 16, 2021 falls on October 6, 2021 at 08:05 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.