February is packed with interesting observances, but one that stands out is Leap Day—and the Leap Year that makes it possible ...

We once used to embrace a 13-month calendar, and some cultures still follow this format. So why are they 12 months instead of 13?

Know the dates for the end of Lent, Holy Week and Easter Sunday in 2025. Why does Easter start late this year?

Plants do not realize that the true equinox is the exact moment that the sun crosses the equator and when both the North and ...

Easter is a moveable feast - it can happen anytime between March 22 and April 25. It is set using a mathematical calculation ...

As Iranians celebrate the Persian New Year, explore the fascinating calendars still used around the world—shaped by sun, moon ...

The spring equinox marks the astronomical beginning of spring in the Northern Hemisphere. The balance of daylight shifts, ...

A year has 365 days because Earth takes about 365.25 days to orbit the Sun. The extra 0.25 days are balanced by adding a leap ...

Look west and see the sun set. Look east, the full moon rises. Seeing this phenomenon is impressive, but not unique, ...

which is about 10 to 12 days shorter than the solar year used in the Gregorian calendar. Because of the shorter year, Islamic months drift through the Gregorian calendar. This discrepancy causes ...

At the time of the equinoxes, the sun appears to move from one hemisphere to the other. The vernal equinox in March is when ...