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CLOSEST CONJUNCTION OF JUPITER AND SATURN, Dec 21, 2020, in the hour after sunset
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Jupiter and Saturn will appear so close together on December 21, 2020 that it will seem almost as though they are a single star.
According to The Planetary Society, they have not been this close in 400 years — though close is not really close. They will be 733 million kilometers (457 million miles) apart, but from Earth they will “almost appear to touch, separated by less than one-fourth the width of the Moon.”
They can be seen in the hour after sunset in the southwest sky throughout the month of December, but will be at their closest on December 21.
Conjunctions like this happen every 20 years, but this is the closest they will be for another 60 years.
NASA and the Planetary Society website have more information.