Dec. 21: The shortest day of the year on earth

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The first day of winter, Dec. 21, is defined by the year’s shortest day and longest night. It is cause to celebrate because each new day brings more daylight and less darkness. Until spring, day-length increases just a bit each day.

Winter solstice

The first day of winter is often called the winter solstice, but the solstice is a moment in time, not an entire day. The solstice in the Northern Hemisphere occurs when the Sun is directly above the Tropic of Capricorn in the Southern Hemisphere. It is that instant when the North Pole is tilted furthest from the Sun (23.5 degrees). This year the solstice occurs at 6:03 pm ET on Dec. 21st. Think of the solstice as the official shotgun start of winter.

Meanwhile, the South Pole becomes the Land of the Midnight Sun with 24 hours of daylight, and the North Pole experiences the exact opposite. There is no daylight north of the Arctic Circle this time of year.

The exact times and dates of these events vary from year to year due to the imprecision of our calendar year, the exact motion of the earth, and the “wobble” of the earth on its axis.

Feasts and celebrations

Even ancient cultures observed the predictable changes in day-length associated with the solstice. There was no guarantee of surviving the winter; starvation was common. So before winter gripped temperate and northern areas, people celebrated with feasts. Most farm animals were slaughtered so they would not have to be fed during the winter. Fresh meat was a luxury. Alcoholic beverages were fermented and ready to be quaffed. This is one reason we celebrate year-end feasts to this day.

Owl listening

To mark the solstice, I step outside after dark and listen. Great horned owls are the quintessential “hoot owls” people sometimes hear, but seldom see, and they’ve already begun courting; their song is a series of muffled hoots. The male has a deeper voice, so it’s easy to detect a dueting pair. Listen for a series of five to seven simple hoots. A five-syllable song may suggest the phrase, “Don’t kill owls, save owls!”

Claim a nest

By mid-January, great horned owls have usually claimed an old crow or red-tailed hawk nest. They don’t bother building their own. Sometimes they’ll choose an old tree cavity, if there’s one big enough within their territory. Older females may lay eggs by the end of January, though many probably delay egg-laying until February.

Clutch size averages two to three eggs, and incubation takes about 35 days. The female does most of the incubating. After hatching, both parents provide a steady supply of rabbits, rats, mice, opossums, and skunks for the owlets.

Fairy diddles

Another sound of the solstice you might hear near bird feeders stocked with sunflower seeds or peanuts is a high pitched squeaking. If you hear these sqeaks, turn on a porch light or direct a powerful flashlight to the feeders.

Flying squirrels, sometimes called fairy diddles, are common in deciduous woods but strictly nocturnal, so most people never see them. But they are quite social during the winter and sleep in tree cavities and nest boxes in groups of four to 12 individuals. When they emerge to forage after dark, they do so as a group, so if you see one at a feeder, you’ll probably see several.

And if you’re lucky enough to see a group of flyers in action, you’ll notice they do not fly. They glide from the tree to tree courtesy of a flap of skin that runs from wrist to ankle on each side of the body. Upon takeoff, this skin billows and permits a controlled glide from tree to tree. Most flights are short, 30 to 40 feet, but biologists have observed flights as long as 300 feet.

Winter won’t last

Whether you celebrate the solstice with a feast, by listening for owls, or watching flying squirrels, it’s good to know that after three months of increasingly shorter days, photoperiod begins to lengthen. And that is the one absolutely reliable environmental cue that winter won’t last forever.

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Scott Shalaway, who holds a Ph.D. in wildlife ecology from Michigan State University, writes from his home in rural West Virginia. A former faculty member at Oklahoma State University and the University of Oklahoma Biological Station, he has been writing a weekly nature column for newspapers and freelancing for magazines since 1986. He can be heard on Birds & Nature from 3-4 p.m. Sunday afternoons on 620 KHB Radio, Pittsburgh, or live online anywhere at www.khbradio.com, or on the Tune-In radio app. Visit his website at www.drshalaway.com or contact him directly at sshalaway@aol.com or 2222 Fish Ridge Road, Cameron, WV 26033.

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