Winter Solstice Day 2025 Usa. Winter solstice marks the shortest day and longest night of the year in the northern hemisphere. The first day of winter (winter solstice or december solstice) is when the sun is in its most southern position directly over the tropic of capricorn.

Saturn at solar conjunction—behind sun—moving to morning sky march 14: The winter solstice is the shortest daylight and the longest night.