In a word, the Roman calendar was unreliable. Predicting seasonal changes, marking feast days, conducting business, and day-to-day civic governance were all made more difficult by the ...

Wepet Renpet was intrinsically linked to the heliacal rising of Sirius, which heralded the summer solstice and the annual ...

It was no easy task as Caesar ended up giving us the longest year in history of 445 days based on the advice of an astronomer. As well as Mercedonius, he added two other months, one of 33 days and ...