We all know (and use) that saying “once in a Blue Moon,” but what does it really mean?
Well, Blue Moons are something special. It is when two full moons fall within a single calendar month. According to sky watchers, astrologists, and astronomists, this happens seven times in every 19 years. For example, if February doesn’t have a full moon, there will be two full moons in January and March.
Here are some dates over the next handful of years, when there are two full moons:
August 22, 2021
August 31, 2023
August 19, 2024
May 31, 2026
May 20, 2027
December 31, 2028
August 24, 2029
September 30, 2031
August 21, 2032
July 31, 2034
May 22, 2035
January 31, 2037
source: https://thoughtcatalog.com/january-nelson/2021/02/moon-names/













