The calendar has changed throughout the history of man. It's development is considered one of the greatest achievements of the human race.

Dec 22, 2010 - David Keith

This traces the development and evolution of the modern calendar, from the system established by Julius Caesar in 46 B.C. to that of Pope Gregory XIII in 1482.

Jan 2, 2008 - Allan M. Heller

How did the modern calendar come to be? The history of the calendar illustrates our evolving understanding of the universe.

May 1, 2007 - Katharine M. J. Osborne

January 1 marks the end of the last year and a fresh beginning of the new year. However, history reveals that this has not always been the case.

Dec 31, 2010 - Diane Evans

Originally lunar based, the Roman calendar measured the Roman civic year. Its reorganisation by Julius Caesar made it the basis for the modern western calendar.

Oct 13, 2009 - Natasha Sheldon

Although shrouded in an undocumented past, the calendar has developed to a point of being a relatively accurate reflection of the solar year.

Oct 26, 2010 - Tony De Vita

The Holocene Calendar doesn't use the birth date of an individual man as its starting point. It used the birth of Human Civilization.

Jun 21, 2010 - Mark Alexander Bain

With American Idol kicking off tonight audiences can once again chart the year's progress by the music Svengali's omnipresence.

Jan 13, 2009 - Rowan Darby

Historical records set down between 1582 and 1752, and again much later, can confuse the unwary who fail to check the dating system being used by a writer.

Oct 19, 2010 - Margaret Woodward

Some genealogists report an ancestor was born in 1730/31. Others say an ancestor was born 1730-31. What is the difference?

Aug 25, 2009 - Rosemary E. Bachelor

This year, 2012, is a leap year. Have you ever wondered why this occurs, or how different cultures incorporate a leap day into their calendars?

Feb 23, 2012 - Ian Shoust

How a culture chooses to date the year is inspired by that culture's religion. With many different religions in the world, it's no surprise in the variety of calendars.

May 11, 2009 - David Schauer

Many people will be preparing for the new year with a specific goal in mind, called a resolution. Who started this tradition, and where did it come from?

Dec 26, 2009 - Nathan Collier

April Fools' Day is an informal, lighthearted holiday that is celebrated in the spring with pranks, jokes, fun and games, but its origins are a mystery.

Mar 12, 2011 - Paula I. Nielson

Easter is one of a few holidays that falls on a different date every year. This is due to calculations based on the lunar cycle.

Feb 6, 2010 - Ashley Anderson

Celebrate Leap Year in 2008 with the following online projects for children that are fun, educational and free.

Feb 15, 2008 - Jace Shoemaker-Galloway

Time is measured by man against the heavens, with many adjustments. In recent years it is more accurately measured, making it almost an exact science.

Jan 4, 2010 - Corinne Shibley

These Easter trivia include facts about the origins of Maundy Thursday, Maundy Money, the Easter Bunny, the Easter Bilby and the differing dates of Easter.

Jan 7, 2010 - James Parsons

April Fools Day is known as a day for practical jokes and pranksters. The holiday dates back several centuries to the Middle Ages.

Mar 23, 2010 - Ashley Anderson

How adoption of a new calendar removed eleven days from the year and changed when George Washington, and a new nation, would celebrate his birthday.

Jan 23, 2008 - Jacqueline T Lynch