Glossary

W

Waxing Crescent

This phase occurs when the visible moon is partly but less than one-half illuminated by direct sunlight. The illuminated part is increasing. Learn more on Wikipedia.

Waxing Gibbous

This phase occurs when the moon is more than one-half but not fully illuminated by direct sunlight. The illuminated part is increasing. Learn more on Wikipedia.

Waning Gibbous

This phase occurs when the moon is partly but more than one-half illuminated by direct sunlight. The illuminated part is decreasing. Learn more on Wikipedia.

Waning Crescent

This phase occurs when the moon is partly but less than one-half illuminated by direct sunlight while the illuminated part is decreasing. Learn more on Wikipedia.