The waxing gibbous Moon, December 28.
Image: NASA SVS, LRO, Ernie Wright.

Tonight the Moon will exhibit a waxing gibbous phase with about 98% disk illumination. The next full moon occurs on December 29 at 9:28 pm. The December full moon is often called the Full Cold Moon. Observing full moons each year was one method people used to track time.