JUPITER, SATURN MERGE IN NIGHT SKY, CLOSEST SINCE JULY 1623

Jupiter and Saturn merged in the night sky Monday (Tuesday, December 22, 2020, in Manila), appearing closer to one another than they have since Galileo’s time in the 17th century, Marcia Dunn reported for the Associated Press (AP).

Astronomers say so-called conjunctions between the two largest planets in our solar system aren’t particularly rare. Jupiter passes its neighbor Saturn in their respective laps around the sun every 20 years.

But this one is especially close: Jupiter and Saturn will be just one-tenth of a degree apart from our perspective or about one-fifth the width of a full moon. They should be easily visible around the world a little after sunset, weather permitting. This conjunction has been called the Star of Bethlehem since it comes close to Christmas.

Toss in the winter solstice in the Northern Hemisphere, the longest night of the year — and the summer solstice in the Southern Hemisphere — and this just-in-time-for-Christmas spectacle promises to be one of the greatest of Great Conjunctions.

“What is most rare is a close conjunction that occurs in our nighttime sky,” said Vanderbilt University’s David Weintraub, an astronomy professor.

“I think it’s fair to say that such an event typically may occur just once in any one person’s lifetime, and I think ‘once in my lifetime’ is a pretty good test of whether something merits being labeled as rare or special.”

It will be the closest Jupiter-Saturn pairing since July 1623, when the two planets appeared a little nearer. This conjunction was almost impossible to see, however, because of its closeness to the sun.

Considerably closer and in plain view was the March 1226 conjunction of the two planets — when Genghis Khan was conquering Asia.

Monday’s conjunction will be the closest pairing that is visible since way back then. Saturn and Jupiter have been drawing closer in the south-southwest sky for weeks. Jupiter — bigger and closer to Earth — is vastly brighter.

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