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Great Conjunction of Planets Will Create 'Christmas Star' Effect

The Dec. 21 Great Conjunction is the closest Jupiter and Saturn have appeared since 1623

By Kyrie Collins, publisher of Highlands Ranch-Parker-Castle Rock-Lone Tree, Colo. December 21, 2020

Look toward the southwest in the hour after sunset on Monday, December 21 and you'll see a celestial event no one has witnessed in hundreds of years.

It's called the Great Conjunction of 2020 and marks the alignment in the sky of Saturn and Jupiter, which happens approximately every 20 years. Although actually hundreds of millions of miles apart, our two largest planets appear so close to each other that stargazers can view them both through a telescope at the same time.

What makes this year unique, though, is that the planets will appear to be just 1/10 of a degree apart, or — to put it in perspective — one-fifth the width of our moon. This is the closest Great Conjunction since July 1623, when Galileo was studying the stars. However, the planets’ paths were too close to the sun then, so it’s unlikely that Galileo — or anyone else, for that matter — was able to view it. The last observable time they appeared this close together was in 1226, in the days of Genghis Khan and medieval knights and before telescopes were invented.

Additionally, in this very unusual year, the Great Conjunction will take place on the winter solstice, December 21. It is being called the Christmas star, as astronomers have long speculated that the “Star of Bethlehem” could have been another rare conjunction involving Jupiter and Saturn around the same time of year.

The superstition

The Great Conjunction has long been a source of mystery and wonder, influencing the writings of philosophers, scientists, artists, and astrologers. Dante incorporated the 1325 conjunction into The Divine Comedy. William Shakespeare supposedly wrote Hamlet under the influence of the Grand Mutation Conjunction that took place in 1600.

Some have perceived a Great Conjunction to be an omen of bad things to come. Gersonides, a French Jewish philosopher, predicted the 1345 conjunction would bring “diseases and deaths which would last for a long time.” The bubonic plague, also known as The Black Death, began spreading across the globe in 1346. 

Many astrologists simply see it as a sign of great change. Whether the change will be good or bad remains to be seen, and probably depends on one’s perception. As Mother Aughra from the 1982 cult classic The Dark Crystal explains, “The Great Conjunction is the end of the world... or the beginning. End, begin, all the same! Big change! Sometimes good, sometimes bad!”

We vote for the good, given 2020 has already given most of us the bad.

How to View the Great Conjunction of 2020

Look toward the southwest in the hour after sunset on Monday, December 21. Saturn and Jupiter should be visible low on the horizon and appear as one bright light to the naked eye. If you have a good pair of binoculars, you may be able to see all four of Jupiter’s moons. With a small telescope, you should be able to view both planets, along with Jupiter’s and Saturn’s moons. If you see it, you'll be among the first in human history to view such a close conjunction through a telescope. Pretty cool, right?

Want to take a photo? NASA provides photo-taking tips for both DSLR cameras and cell phone cameras.

Kyrie Collins is the publisher of Highlands Ranch-Parker-Castle Rock-Lone Tree, Colo.

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