What is a full moon?

Full moon, astronomical term. Refers to the phase when the moon moves to the position opposite to the new moon, which is opposite to the sun, and the entire circular surface of the moon facing the earth is illuminated. In addition, the folk term "full moon" refers to the time when the moon moves on the celestial sphere to the opposite side of the sun during the lunar calendar 15 and 16. The distance between the sun and the moon is 180, that is, the earth lies between the sun and the moon. Seen from the earth, all the light of the moon is directed towards the earth. At this time, the moon phase is called "full moon" or "full moon".