The winter solstice is Friday. Get ready for the longest night of the year.

Here comes winter.

The winter solstice – marking the longest night and fewest hours of daylight of the year – is Friday. It's the precise moment at which the Northern Hemisphere is tilted farthest from the sun.

The solstice occurs at the same instant everywhere on Earth. In the United States, it happens at 5:23 p.m. ET Friday (4:23 p.m. CT, 3:23 p.m. MT, and 2:23 p.m. PT).

At that moment, the sun's rays are directly over the Tropic of Capricorn, a line of latitude that circles the Earth in the Southern Hemisphere.

Friday also marks the astronomical beginning of winter, even though meteorologists and climatologists view winter as starting Dec. 1, which is the start of the coldest three months in the Northern Hemisphere. After the solstice, the days slowly start to get longer again.

However, most locations don't have their earliest sunset or latest sunrise on the solstice. Those events occur either weeks before or after Dec. 21.

Additionally, winter's shortest day is typically not the coldest day of the year. There is a bit of a lag between the shortest day of the year and the coldest average temperatures for most spots in the USA.

This lag in temperature occurs because even though the amount of daylight is increasing, the Earth's surface continues to lose more heat than it receives from the sun. In most locations across the U.S., the minimum daily temperature average occurs around two or three weeks later, in early to mid-January.

For example, the coldest days in Boston, on average, are Jan. 17-26. In Chicago, it's Jan. 17-20, and in Miami, it's Jan. 2-22. At the end of January, more heat finally begins arriving than leaving, and days slowly start to warm up.

If you hate the cold you're in luck: At least for the next couple of weeks, bitter cold isn't expected: A relatively mild stretch is expected to develop and persist into late December for much of the U.S. as the source of the air across the Lower 48 will be from the Pacific Ocean, rather than the Arctic, the Weather Channel said.

However, beyond that, there are some signs the infamous polar vortex may make its chill return in January.

More: Polar vortex? Back in the day, we called it 'winter'

Why do we have the seasons? Because the Earth is tilted on its axis. During the Northern Hemisphere's winter, the land north of the equator is tilted away from the sun, which lowers the amount of the sun's energy warming the Northern Hemisphere.

Of course, it's all opposite in the Southern Hemisphere, where Dec. 21 marks the beginning of astronomical summer.

The Earth is tilted because of collisions with various proto-planets and other massive objects during the formation of the solar system billions of years ago, according to NASA.

Thus, the reason the Earth has the perfect temperature for life to form is a few random collisions with other space rocks uncounted eons ago.

One of the most famous solstice celebrations occurs at the ancient Stonehenge ruins in Wiltshire, England, where druids, pagans and other revelers gather each year to celebrate the event.

The winter and summer solstices, along with the equinoxes, loom large in myth and folklore.

"Culturally, the solstices and equinoxes are typically used to denote either the beginnings of the seasons or the center points of the seasons," as in England, said Rick Kline of the Spacecraft Planetary Imaging Facility at Cornell University.

"Christmas, Hanukkah, Kwanzaa and other holidays have arisen out of the solstices, equinoxes and the midpoints between them," he said.

Contributing: Elizabeth Weise, USA TODAY

This article originally appeared on USA TODAY: The winter solstice is Friday. Get ready for the longest night of the year.