Moon phase on December 21, 2023

Waxing Gibbous, 63%
🌔 Waxing Gibbous
Thursday, December 21, 2023 · at noon (Brasília)
Illumination: 63% Age: 8.6 days Cycle: 29%

On Thursday, December 21, 2023 the Moon was in its waxing gibbous phase, with 63% of its disk illuminated and an age of 8.6 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
Illumination63%
Moon age8.6 days
Day of the weekThursday
Last new moonDecember 12, 2023 at 20:32
Next full moonDecember 26, 2023 at 21:33 (in 5.4 days)
Next new moonJanuary 11, 2024 at 08:57 (in 20.9 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.

← December 20, 2023 December 22, 2023 →

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 December 21, 2023 it had completed 29% of the cycle that began with the new moon on December 12, 2023.

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 December 21, 2023. For sun times, check sunrise and sunset.

Frequently asked questions

What is the Moon phase on December 21, 2023?

On December 21, 2023 the Moon was in its waxing gibbous phase, with 63% 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: 8.6 days of an average 29.53-day cycle.

When is the next full moon after that date?

The next full moon after December 21, 2023 falls on December 26, 2023 at 21:33 Brasília time.

When is the next new moon after that date?

The next new moon after December 21, 2023 falls on January 11, 2024 at 08:57 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.