TIL "once in a blue moon" is around every 2.7172 years and is coincidentally close to the number e.
https://www.britannica.com/science/blue-moon-astronomy#:~:text=of%20their%20length.-,On%20average%2C%20a%20blue%20moon%20occurs%20once%20every%2033%20months,about%20four%20times%20per%20century.
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1ggpph0/til_once_in_a_blue_moon_is_around_every_27172/
https://www.britannica.com/science/blue-moon-astronomy#:~:text=of%20their%20length.-,On%20average%2C%20a%20blue%20moon%20occurs%20once%20every%2033%20months,about%20four%20times%20per%20century.
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1ggpph0/til_once_in_a_blue_moon_is_around_every_27172/
Blue moon | Astronomy, Lunar Phases & Folklore | Britannica
Blue moon, the second full moon in a calendar month. The period from one full moon to another is about 29 12 days, so when two occur in the same month, the first of these full moons is always on the first or second day of the month.Encyclopedia Britannica
