Ben Franklin turns 300, twice

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Organizers in Philadelphia are gearing up for the Jan. 17 celebration of Benjamin Franklin's 300th birthday with pomp and pageantry. But there is just as much reason to party this Friday, Jan. 6, which was Franklin's birth date before time skipped ahead 11 days in 1752.

This little-known ripple in American history was a result of the switch from the Julian calendar to the Gregorian calendar, part of an ongoing struggle to realign the days with Earth's orbit.

Because it takes just a bit more than 365 days for the Earth to rotate around the Sun, calendars eventually shift out of line with the seasons unless adjustments are made.

The Julian system, introduced by the Romans in 46 B.C., was advanced for its day but still added 11 minutes every year.

When Britain and its American colonies reluctantly adopted the new system in 1752, a jump of eleven days was necessary to correct the imbalance. By legal decree, at midnight on the night of Sept. 2, the clock ticked forward and it became Sept. 14.

Anyone living at the time of the skip had to adjust their thinking as well as their birth dates. To avoid confusion, dates were referred to as "Old Style" or "New Style," as Franklin does writing about an uncle in his autobiography of 1771: "He died in 1702, Jan. 6, old style, just 4 years to a day before I was born."

Officials throughout the British Empire were also forced to quell taxpayers' fears that they would have to fork over money for days that never existed.

A common story, which Poole denounces as mostly folklore, goes that some people believed their lives were actually being shortened and rioted to get their eleven days back.

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