This is known as a "blue moon" and occurs about once every 2-3 years. What makes this month's blue moon even more special is that it will also be a "supermoon"! WBZ-TV graphic CBS Boston ...

A supermoon, which occurs when the moon is full at the moment when its orbit is closest to Earth, appeared in the night sky Tuesday. The Old Farmer’s Almanac predicted a rare two supermoons this ...

It isn't blue but is the name given to the second full moon within a month. The Farmer's Almanac says this will be the biggest and brightest full supermoon of 2023.