Saturday, June 21, marks the first official day of summer in the Northern Hemisphere, when the sun reaches its northernmost point in the sky. But did you know that the summer solstice, as it's called, is the longest day of the year? Here are five facts to know about the first day of summer. When does the summer solstice begin, exactly? In the Northern Hemisphere, the summer solstice begins at 6:51 a.m. EDT on June 21, according to Almanac.com, officially ringing in summer. The date … [Read more...]