Moon phase on December 23, 2025

Waxing Crescent, 13%
🌒 Waxing Crescent
Tuesday, December 23, 2025 · at noon (Brasília)
Illumination: 13% Age: 3.6 days Cycle: 12%

On Tuesday, December 23, 2025 the Moon was in its waxing crescent phase, with 13% of its disk illuminated and an age of 3.6 days since the last new moon. A thin lit sliver appears low in the western sky just after sunset and sets shortly after the Sun.

Moon data for this date

Moon at noon Brasília time (UTC-3)
Phase🌒 Waxing Crescent
Illumination13%
Moon age3.6 days
Day of the weekTuesday
Last new moonDecember 19, 2025 at 22:43
Next full moonJanuary 3, 2026 at 07:03 (in 10.8 days)
Next new moonJanuary 18, 2026 at 16:52 (in 26.2 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.

← December 22, 2025 December 24, 2025 →

About the waxing crescent

A thin lit sliver appears low in the western sky just after sunset and sets shortly after the Sun. The phase name comes from the Moon's position in its 29.53-day cycle: on December 23, 2025 it had completed 12% of the cycle that began with the new moon on December 19, 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 December 23, 2025. For sun times, check sunrise and sunset.

Frequently asked questions

What is the Moon phase on December 23, 2025?

On December 23, 2025 the Moon was in its waxing crescent phase, with 13% 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: 3.6 days of an average 29.53-day cycle.

When is the next full moon after that date?

The next full moon after December 23, 2025 falls on January 3, 2026 at 07:03 Brasília time.

When is the next new moon after that date?

The next new moon after December 23, 2025 falls on January 18, 2026 at 16:52 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.