A Full Moon is the phase of the Moon when it is fully illuminated as a circle. Full Moons occur approximately every 28 days. Lunar eclipses may only occur during a Full Moon, while solar eclipses may occur only during a new moon.
Two full moons in a month - a fairly rare occurrence (every 32 months) - is called a "blue moon," leading to the phrase "once in a blue moon" to describe things that happen rarely.
The phases of the moon are:
- New Moon
- Waxing Crescent (looks quarter full)
- First Quarter (looks half full)
- Waxing Gibbous (looks three quarter full)
- Waning Gibbous (looks three quarters full)
- Third Quarter (looks half full)
- Waning Crescent (looks quarter full)
- New Moon(again)