The Gregorian Calendar NPR's Rick Karr reports that the Gregorian calendar used in U.S and Western Europe, and accepted around the world, is a fairly arbitrary human invention.
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The Gregorian Calendar

Only Available in Archive Formats.
The Gregorian Calendar

The Gregorian Calendar

The Gregorian Calendar

Only Available in Archive Formats.

NPR's Rick Karr reports that the Gregorian calendar used in U.S and Western Europe, and accepted around the world, is a fairly arbitrary human invention.