Today is the winter solstice and the first day of winter in the Northern Hemisphere. It's all due to Earth's tilt, which ensures that the shortest day of every year falls around December 21.
Winter Solstice 2009: Facts on Shortest Day of the Year
Today is the winter solstice and the first day of winter in the Northern Hemisphere. It's all due to Earth's tilt, which ensures that the shortest day of every year falls around December 21.
Winter Solstice 2009: Facts on Shortest Day of the Year
