Every June, Birches Elementary School mathematics teacher Judy Rose challenges some of the school’s first, second and third grade students with a “Math Calendar” that they can complete over their ...

PORTSMOUTH — Have you ever wondered how other calendars deal with the extra day associated with a leap year? Here's a quick guide to help you sort it all out. The Gregorian calendar The Gregorian ...

When I read that this July was extremely rare (823 years), it didn't seem right, so I got to thinking about calendars. The first of January has to start on one of the seven days of the week. So for ...