Winter solstice, falling this year on Sunday, Dec. 21, marks the first day of winter in the Northern Hemisphere. More precisely, winter officially begins at 6:03 p.m. ET — the moment when the Northern Hemisphere is pointed at its furthest distance from the sun. This means winter solstice boasts the longest night and the shortest day, and often colder temperatures, too.
But the good news? If you’re not a fan of winter, from each day on after the solstice, the days will get longer and warmer until the calendar hits summer solstice, June 21, 2015. Summer solstice marks the first day of summer, the longest day of the year in the Northern Hemisphere.