When the entire face of the moon is visible from Earth, opposite the sun and unobstructed from Earth's shadow, it is considered a full moon. A full moon occurs approximately every 29 days.
The full moon rises in the east. Astrologically speaking, the full moon phase lasts less than three days. Astrologers believe that full moons are when energy peaks. Many cultures schedule their rituals and ceremonies to happen during a full moon because of this.