From schoolkids learning about constant numbers to pizza deals to school serious math equations, here’s a slice of Pi Day fun ...

Why isn’t the date for Easter fixed in the same way as other Christian holidays? Christmas, for example, is always December ...

These reforms were implemented around 45 BCE, roughly a year before his death, and came to be known as the Julian calendar. The revamped system had 365 days, with a leap year added every four years, ...