How to watch tonight’s ‘great conjunction’ of Jupiter and Saturn

How to watch tonight’s ‘great conjunction’ of Jupiter and Saturn

This evening, on the first day of astronomical winter, you may be able to see a rare phenomenon witnessed when the famous astronomer Galileo Galilei was alive: Jupiter and Saturn will appear so close to one another in the night sky, the gassy behemoths will look like one star: the Christmas star.

Called the great conjunction, the seemingly snuggled-up planets will appear just a tenth of a degree apart, or about one-fifth the diameter of a full moon. While the great conjunction occurs every 20 years, the planets haven’t been this close to each other since July 16, 1623, or 397 years ago, according to timeanddate.com. And the last time the planets were this close to each other at night, when the sun’s glare didn’t make it impossible to see, was in 1223 — nearly 800 years ago!

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