(KALB) - What makes a supermoon so super? Here are some cool facts about the lunar experience:
Dave Doe / CC BY 2.0 / MGN
Supermoons occur 4 - 6 times a year. It usually only occurs a few times because of the moon's orbit and how it changes orientation.
The moon appears a little brighter and closer than normal. The moon's orbit around the Earth is not a perfect circle. This is due to tidal and gravitational forces pulling the moon.
Supermoons happen when the full moon coincides with the moon's closest approach to Earth in its orbit. The average distance is about 238,000 miles from the Earth. This changes though when we have a perigee or apogee. Apogee is when it is the furthest away from Earth and a perigee is when it is closest.
There needs to be two factors for a supermoon to occur: a perigee which happens during a 27-day orbit and the full phase which is every 29.5 days.
You can see the supermoon this Sunday, on December 3.