A winter solstice is an astronomical event that marks the shortest day and the longest night each year. A winter solstice happens when either of the earth’s poles tilts at the furthest angle away from the sun.

As of 2015, the United States will experience the December, or winter, solstice on Tuesday, Dec. 21, at 11:49 pm Eastern Standard Time. The December solstice usually occurs between Dec. 20 and Dec. 23.

A solstice is defined as the point during the Earth's orbit around the sun at which the sun is at its greatest distance from the celestial equator, while an equinox is at its least distance. A solstice is characterized b...


The longest night of the year in the Northern Hemisphere is December 21, also known as the winter solstice and the first official day of winter. The longest night of the year in the Southern Hemisphere is June 21.

The shortest day of the year is called the winter solstice. The winter solstice occurs on the 21st of December in the Northern Hemisphere.

The days start getting longer every year after the winter solstice, which falls on the first day of winter, the shortest day of the year. The first day of winter is typically December 21 or 22 in the Northern Hemisphere.

The Sun appears to move across the sky during the day due to the rotation of Earth along its axis. Because Earth rotates from east to west, the Sun first appears on the eastern horizon and then moves westward across the ...