#Sweden decided to adopt the #GregorianCalendar in 1700, but tried to skip issues with skipping days by omitting 11 #LeapYears between 1700 and 1740 until Swedish dates matched those of #Catholic countries. This completely failed, and Sweden just skipped a bnch of days in 1753. In the intervening chaos, February had 30 days in Sweden in 1704 and 1708.

In principle, the position of #Mercedonius was supposed to switch back and forth in alternate #LeapYears, but this was never consistent. Even if it was, it would result in a mean year of 366.25 days, this giving a calendar that didn't track the #sun OR the #moon, because the #Romans were just *the worst* at timekeeping.

But wait! It gets worse!

#RomanCalendar