What Moon phase Is Half Dark And Half Bright?

The Moon phase that is half dark and half bright is called the First Quarter or Third Quarter Moon. During the First Quarter, the right half of the Moon appears illuminated, while the left half is in shadow, as seen from the Northern Hemisphere. Conversely, during the Third Quarter, the left half is illuminated, and the right half is dark. Both phases occur roughly a week after the New Moon and a week before the Full Moon, respectively.