People have observed the phases of the moon with great interest since ancient times. The full moon is what has always attracted attention - there are also a number of rituals and beliefs associated with its appearance.
A Full Moon is observed when the Earth comes between the Sun and the Moon. Then the light from the Sun cannot illuminate the satellite of our planet.
If we have to describe this phenomenon in simple words, we will say that the Full Moon is observed when the Moon is in opposition to the Sun.
During a Full Moon, the Earth-facing hemisphere of the Moon is almost entirely bathed in sunlight. At the same time, the other side of our satellite, which is invisible from Earth, remains completely hidden from the Sun as well.
The full moon is a phenomenon that is observed every 20.53 days. The Full Moon itself begins two days before and lasts two days after the actual phase.
A simple calculation shows that there are 12 or 13 Full Moons in a calendar year. In rare cases, two full moons can be observed within 1 month. This phenomenon is called Blue Moon.