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Groundhog Day
A traditional North American holiday celebrated annually on February 2, predicting the weather based on a groundhog's behavior.
Groundhog behavior indicating six more weeks of winter
If the groundhog sees its shadow on a sunny day, it retreats underground.
Groundhog behavior indicating an early spring
If the groundhog does not see its shadow on an overcast day, it signals that spring is imminent.
Astronomical background of Groundhog Day
It coincides with a 'cross-quarter day,' the midpoint between the winter solstice and the spring equinox.
Candlemas
A Christian feast day from which Groundhog Day evolved, linked to the weather and predicting the length of winter.
German traditions associated with Groundhog Day
Originally used badgers or hedgehogs to predict the weather based on their shadows.
Punxsutawney Phil
The most famous groundhog, central to the Groundhog Day celebration in Punxsutawney, Pennsylvania.
Accuracy of Phil's forecasts
Phil's predictions have an accuracy rate of roughly 40%, which is statistically worse than random chance.
Purpose of emergence for male groundhogs in February
They emerge to assess territory, locate female burrows, and prepare for mating season.
Cultural impact of the film Groundhog Day
The 1993 film popularized the idiom for situations where events are repetitively monotonous.