Cory’s Reviews > A Short History of Time > Status Update

Summary: combine lunar calendars with solar calendars, add in multiple religious concerns, market cycles, variances by country, equinoxes, throw in trying to figure out when Easter should be celebrated, a pretentious emperor or two, and stir it up with hundreds of years of imprecise knowledge of several different factors and… good luck!

I absorbed maybe 20% of this, but it’s pretty fascinating.