Our August full moon guide tells you everything you need to know about the Sturgeon Moon, including where and when to see it.

Many Western countries – including the U.S. – use the Gregorian calendar, which is based on a system of 365 days (plus a leap day every four years). Lunar New Year is based the moon's 12 phases.

Gregorian Calendar Events: The Gregorian calendar also has significant cultural events (like Christmas and New Year's Day), but these are not linked to lunar phases.

A lunar month is the period of time from one new moon to the next — about 29.5 days — so the lunar calendar doesn't precisely align with the common one where most months span 30 or 31 days.

Many Western countries – including the U.S. – use the Gregorian calendar, which is based on a system of 365 days (plus a leap day every four years). Lunar New Year is based the moon's 12 phases.

Due to the complexities of the various types of calendars, the date of Easter can be as early as March 22 and as late as April 25. Here's why.

Many Western countries – including the U.S. – use the Gregorian calendar, which is based on a system of 365 days (plus a leap day every four years). Lunar New Year is based the moon's 12 phases.

The Lunar New Year is celebrated in Manhattan’s Chinatown neighborhood, Feb. 5, 2019. It can be easy to think of a calendar as a scientific given, or a reflection of the laws of the universe.

The western, or Gregorian, calendar that has come to dominate the modern world, is based on a solar, or tropical, year, with each other year representing the amount of time between one Spring ...

Because the lunar calendar is always 29 ½ days and the Gregorian Calendar is not in sync, Easter can be any Sunday from March 22 to April 25!