The term supermoon is used to describe a full or new moon that occurs when the moon is at or near perigee, its nearest position to the Earth. The astronomical term for this phenomenon is perigee-syzygy.
The term “supermoon” was first coined in 1979 by astrologer Richard Nolle1 who defined a supermoon is a new or full moon that occurred within 90% of perigee. According to this definition, a supermoon happens about 3-5 times a year, some more impressive than others.
Nolle believed that this period was marked by “geophysical stress” caused by the increased influence of the moon and some astrologers will mark this time to be watchful for earthquakes, volcano eruptions, and severe weather patterns.
Many witches believe that the supermoon is the most opportune time to do any lunar magic of any sort. The energy of the sign that the moon happens to be traveling through at that time would also be greatly enhanced.
Upcoming Supermoon Dates
On Sunday, December 3 2017, the full moon in Gemini will be 357,495 km from the Earth
On Tuesday, January 2, 2018, the full moon in Cancer will be 356,565 km from the Earth
On Friday, July 13, 2018, the new moon in Cancer will be 357,431 km from the Earth
On Saturday, August 11, 2018, the new moon in Leo will be 358,802 km from the Earth
See more dates at https://www.vercalendario.info/en/when/next-super-moon.html
The average distance between the Earth and the moon is 382,500 km, the furthest it can be is just over 405,696 km and the closest it can be is 363,105 km