The Gregorian calendar we use today was created in the 1580's by Pope Gregory XIII. Start your new year here, and discover the history of the calendar's development.
What is time? Albert Einstein explained that time as we know is an invention when he said "Space and time are modes by which we think, not conditions under which we live.
My pick of the day is the beautifully illustrated Calendars through the Ages.
"Since the dawn of civilization man has kept track of time by use of the sun, the moon, and the stars.
"In the 1840's a Greenwich standard time for all of England, Scotland, and Wales was established, replacing several 'local time' systems.
World Book editors have created a site for elementary and middle-school students that answers basic questions about the invention of the calendar.
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