As the sun sets early in the day for the winter solstice - that's 21 December for non-pagans - those gazing to the heavens will spot Jupiter and Saturn sitting in the sky closer together than anyone living today has ever seen them.
A conjunction occurs when two planets line up close to one another in the night sky, and these are relatively common occurrences.
Although the conjunction will be most visible near the equator, the rare event will be visible in the western sky anywhere on Earth and will be best viewed during twilight.If someone misses both this year and 2080's viewing, they might need to time-travel to the 25th century as the next such sighting is slated to be in the year 2400, according to Scitech Daily.
"You have to go back before the morning of March 4, 1226, to see a close correlation between these things visible in the night sky".
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"On the evening of closest approach on December 21, they will look like a double planet, separated by only 1/5th the diameter of the full moon", said Hartigan. Even if you have an amateur telescope with the right eyepiece, you may be able to see the Galilean moons, the bands of Jupiter, and Saturn's rings, all in one spectacular view.
"The further north a viewer is, the less time they'll have to catch a glimpse of the conjunction before the planets sink below the horizon", Hartigan explained.
Jupiter and Saturn will appear to align this December, creating a "double planet" in the night sky.
If you live in the northern hemisphere, you can observe this planetary conjunction setting in the southwestern sky, shortly after sunset. This year, however, the pair will meet in the closest conjunction in approximately 400 years, merging nearly into a single point in the evening sky of the winter solstice.
It's the first time that this particular alignment has happened for 800 years, to be more precise.