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When it is at its closest we call it perigee.

The Moon's orbit around Earth is elliptical which means there are times when it is further away - apogee - and times when it is closer - perigee.

Full supermoons occur when the orbit of the moon is at perigee - the closest point to Earth in its orbit, which makes the Moon appear bigger and brighter in the night sky.

A supermoon occurs when the full Moon coincides with when the moon is at its closest point to earth in its orbit - the perigee.

Thompson called the latter a “very near lunar perigee.”