Jupiter, Saturn Will Soon Form First Visible ‘Double Planet’ In Nearly 800 Years
Jupiter and Saturn, the two largest planets in the solar system, will soon line up and look like a double planet, a sight not seen since the Middle Ages.
The rare celestial event will occur after sunset on Dec. 21, 2020, the start of the winter solstice.
At their closest, they’ll be only 0.1 degree apart, which is just 1/5 of a full moon diameter.
Photos! Jupiter and Saturn rapidly approaching December 21 conjunction | Astronomy Essentials | EarthSky
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