Each of the four intermediate lunar phases (see below) is around 7.4 days, but this varies slightly due to the elliptical shape of the Moon's orbit. Aside from some craters near the lunar poles, such as Shoemaker, all parts of the Moon see around 14.77 days of daylight, followed by 14.77 days of night.
This Day In History: 02/02/1887 - First Groundhog Day. The first Ground Hog day introducing Punxsutawney Phil, The Adventures of Huckleberry Finn by Samuel Clemens known as Mark Twain is released and the first GI Joe hits the market in This Day in History video. The date is February 2nd.
It is the day that the Groundhog comes out of his hole after a long winter sleep to look for his shadow. If he sees it, he regards it as an omen of six more weeks of bad weather and returns to his hole. If the day is cloudy and, hence, shadowless, he takes it as a sign of spring and stays above ground.