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Jupiter And Saturn Do Align Every 20 Years Or There About. But This Will Be The First Time, In 800 Years, That Such An Alignment Will Take Place In December, Giving Rise To What Many Are Calling The Star Of Bethlehem Or The Christmas Star. The Alignment Will Occur On December 21st, 2020–The Longest Night Of The Year (Winter Solstice).

Jupiter and Saturn will come within 0.1 degrees of each other, forming the first visible "double planet" in 800 years – CBS News

https://www.cbsnews.com/news/saturn-jupiter-winter-solstice-great-conjunction/

The largest planets in our solar system will soon align for the great conjunction — the greatest skywatchers have observed since medieval times.