December 21st Is Winter (Or Summer) Solstice

If the sun appears to set a little earlier (or later) this Sunday, it is not your imagination. That's because depending on where you live, December 21st will be the shortest or longest day of 2014. Also known as the winter (or summer) solstice, it marks the official start of winter for the residents of the Northern Hemisphere and summer for those that live in the Southern Hemisphere.