Moon phase today: December 11, 2025, lunar appearance explained

Quick Summary

• Current Phase: The moon is in its Third Quarter phase tonight, showing 53% illumination.
• Next Full Moon: The upcoming full moon will occur on January 3.
• Viewing Tips: Key lunar features like the Tycho and Kepler Craters are visible tonight.
• Moon Cycle: The moon goes through eight distinct phases over roughly 29.5 days.

It’s the Third Quarter tonight, which basically means there’s only half of the moon on show. Third Quarter is also the second half moon of the lunar cycle, where the left side of the moon is illuminated (if you’re in the Northern Hemisphere).

What is today’s moon phase?

As of Thursday, Dec. 11, the moon phase is Third Quarter. This means 53% of the moon is lit up tonight, according to NASA’s Daily Moon Observation.

If you don’t have any visual aids, there’s still lots for you to spot tonight, including the likes of the Tycho and Kepler Craters and the Oceanus Procellarum. If you have binoculars, you’ll also be able to see the Grimaldi Basin, Clavius Crater, and the Alps Mountains. With a telescope, the Caucasus Mountains, Apollo 15, and the Rima Ariadaeus all come into sight.

When is the next full moon?

The next full moon will be on Jan. 3.

What are moon phases?

NASA says the Moon goes through a cycle of about 29.5 days, and during that time we see its different phases. Even though we always see the same side of the Moon, the sunlight hitting it changes as it orbits Earth. That’s what makes it look full, half-lit, or sometimes completely hidden. The cycle has eight main phases:

New Moon – The moon is between Earth and the sun, so the side we see is dark (in other words, it’s invisible to the eye).

Waxing Crescent – A small sliver of light appears on the right side (Northern Hemisphere).

First Quarter – Half of the moon is lit on the right side. It looks like a half-moon.

Waxing Gibbous – More than half is lit up, but it’s not quite full yet.

Full Moon – The whole face of the moon is illuminated and fully visible.

Waning Gibbous – The moon starts losing light on the right side. (Northern Hemisphere)

Third Quarter (or Last Quarter) – Another half-moon, but now the left side is lit.

Waning Crescent – A thin sliver of light remains on the left side before going dark again.