Many Western countries — including the U.S. — use the Gregorian calendar, which is based on a system of 365 days (plus a leap ...

Civics and Social Studies tests for grades 3-8 are new this year, so their individual score reports will be delayed until after summer 2025. How to Prepare for LEAP Testing: • We encourage you ...

4 Leap years were introduced by the Roman emperor Julius Caesar, who created a new calendar to take the extra quarter-days into account. The Julian calendar took effect in 45 BC. 5 The maths ...

Thursday, March 20, 2025, marks the Persian New Year, or Nowruz, a holiday that's been celebrated for several millenniums, according to the University of Massachusettes. Nowruz, which means “new day” ...