December 21, 2017 all-day
Dec 21 Mar 20, 2017. In the Northern Hemisphere winter beginstoday with the winter solstice, at 5:44 AM, EST. Note that in the Southern Hemisphere today is the beginning of summer. Between the equator and Arctic Circle the sunrise and sunset points on the horizon are farthest south for the year and daylight length is minimum (ranging from 12 hours, 8 minutes, at the equator to zero at the Arctic Circle).