How many different Gregorian calendars are there? I'm assuming 14, one for Jan 1 starting on each weekday plus another seven for the leap years. - Quora
![Demystifying the Gregorian Calendar: A Look into Its History and the Math behind It: Calhoon, Walter A.: 9781625503107: Amazon.com: Books Demystifying the Gregorian Calendar: A Look into Its History and the Math behind It: Calhoon, Walter A.: 9781625503107: Amazon.com: Books](https://m.media-amazon.com/images/I/51BlIQt6BzL._AC_UF1000,1000_QL80_.jpg)
Demystifying the Gregorian Calendar: A Look into Its History and the Math behind It: Calhoon, Walter A.: 9781625503107: Amazon.com: Books
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