A supermoon happens when the moon is at it’s closest point of elliptical orbit to Earth making it appear larger and closer than usual. A lunar eclipse happens when the sun, earth, and moon are lined up with earth in the middle causing the sun to cast a shadow that illuminates the moon so it appears brighter. When both happen at the same time you get what many refer to as a “Blood Moon” because of the red shadow the sun casts on the moon. This is a very rare occurrence that happened last in 1982 and if you miss it this time you won’t be able to see it again until the year 2033.