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“The simple idea of a 13-month perennial calendar has been around since at least the middle of the 18th century. Versions of the idea differ mainly on how the months are named, and the treatment of the extra day in leap year.”
Yay for The Human Calculator Calendar. Boo for not crediting sources. A missed opportunity to replace Jesse’s name with, “Scott.”
Double boo for not explaining the extra day every year, not to mention leap year. (364 / 28 = 13.)
Final boo for conflating the real world ~29.5 day imprecise lunar month with the 28 day English common law lunar month.
“The simple idea of a 13-month perennial calendar has been around since at least the middle of the 18th century. Versions of the idea differ mainly on how the months are named, and the treatment of the extra day in leap year.”
https://en.wikipedia.org/wiki/International_Fixed_Calendar
I had no clue. Thanks for letting me know. :)