The Romans added January and February to the calendar but ran into a problem — math and superstition. Here's why February became the odd month out.

The ancient Egyptian calendar consisted of 365 days without ... the festival occurred at different times of the year. During the Roman occupation of Egypt from the mid-1st to mid-3rd centuries ...

Thank the Romans for that oddity. Before the Gregorian calendar used today, Roman King Numa Pompilius (715-673 BC) set about creating a way to sync the months with the lunar cycle. Doing that ...