A supermoon can only occur at perigee-syzygy, when the moon is full and at perigee simultaneously. This is rare because as the Earth revolves around the sun. the moon's orientation to Earth stays ...

The scientific term for supermoon is perigee syzygy of the Earth—Moon—Sun system, which to me sounds much more exciting." During a supermoon, the moon can appear up to 30 percent brighter and ...