Calendar

Evergreen

Leap Year Day, February 29, exists to reconcile the difference between calendar time and astronomical time. A tropical year, the time between successive vernal equinoxes, is abo...

Guides And Explainers

The Gregorian calendar, introduced by Pope Gregory XIII in 1582, defines the year numbering used by most of the world today. Years are counted from the traditionally recognized...

reference

August 5 is a mid-summer date in the Gregorian calendar that has hosted a range of notable political, scientific, cultural, and sporting events. It sits in a period of high dayl...

calendar-time

The Gregorian calendar year runs about 365.2422 days, yet our calendar year is fixed at 365 days. Without correction, the calendar would drift relative to seasons and astronomic...

Calendar and Timekeeping

A leap day is February 29, a date added to the calendar approximately once every four years to keep our civil calendar aligned with Earth’s orbit around the Sun. Without this...

holidays-observances

Mother's Day in the United States in 2016 was on Sunday, May 8. The holiday is observed on the second Sunday of March through November in Australia and on the second Sunday of M...

calendar

The 41st day of the year is the date reached after counting 41 days from January 1 in the Gregorian calendar. This article explains what day this falls on in common-year and lea...

dates-and-calendar

Jan. 16 is the sixteenth day of the first month in the Gregorian calendar, leaving 349 days remaining in a standard year (350 in a leap year). As a mid-January date, it falls wi...

calendar

Month names come from a mix of Roman deities, numbers, Latin words, and later calendar reforms that aligned the calendar with the solar year. The earliest Roman calendar began w...