On Monday night, December 21, Jupiter and Saturn will look closer together than they’ve appeared since March 4, 1226, almost 800 years ago. This event, taking place on the December solstice, is known as a “great conjunction.””On the evening of closest approach on Dec 21 they will look like a double planet, separated by only 1/5th the diameter of the full moon,” says Rice University astronomy professor Patrick Hartigan.
From Rice University:
Though the best viewing conditions will be near the equator, the event will be observable anywhere on Earth, weather-permitting. Hartigan said the planetary duo will appear low in the western sky for about an hour after sunset each evening…
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