Summer solstice and longest day of the year starts June 20

Mark you watches, because the summer solstice starts at 6:34 p.m. EDT. It's the longest day of the year for those of us living above the equator, and is the first official day of summer, according to AccuWeather.

But just because it's the longest day of the year doesn't mean that it's necessarily the hottest. Watch the video above to learn more about the summer solstice.