(CNN) -
Here's a look at what you need to know about Groundhog Day, an American tradition that aims to predict when spring will arrive.
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February 2 is Groundhog Day.
The groundhog wakes up from hibernation on February 2.
If the groundhog sees its shadow when it comes out of its burrow, there will be six more weeks of winter.
If you don't see your shadow, spring will come soon.
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This tradition began in Europe as Candlemas Day.
Germans who settled in Pennsylvania in the 1700s brought the custom to America.
Punxsutawney Phil of Pennsylvania is the best known, but more than a dozen states celebrate with their own groundhogs, like General Beauregard Lee of Georgia and Buckeye Chuck of Ohio.
Punxsutawney Phil - in Punxsutawney, Pennsylvania
His full name is "Punxsutawney Phil, Seer of Seers, Sage of Sages, Forecaster of Forecasters, and Extraordinary Weather Prophet."
February 2, 1886 -
The Punxsutawney Spirit newspaper proclaims this date as Pennsylvania's first official Groundhog Day celebration.
According to his owners, Phil has correctly predicted early spring 100% of the time.
However, according to the National Oceanic and Atmospheric Administration, the marmot has not shown "any predictability" in recent years.
1986 -
Phil travels to Washington, DC to meet with President Reagan.
1993 -
Columbia Pictures releases the film "Spell of Time", starring Bill Murray.
In the years following the film's release, up to 30,000 people have visited Gobbler's Knob in Punxsutawney.
1995 -
Phil appears on the Oprah Winfrey Show.
January 27, 2010 -
Animal rights group PETA suggests using a robotic marmot instead of Punxsutawney Phil.
February 2, 2010 -
For the first time, fans can sign up to receive a text message alert about Phil's prediction.
February 2, 2015 -
Phil sees his shadow, predicting six more weeks of winter.
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