SANTA BARBARA, CALIFORNIA - DECEMBER 21: Jupiter (L) and Saturn appear about one-tenth of a degree apart during an astronomical event known as a Great Conjunction on December 21, 2020 in Santa Barbara, California. The planets, which remain about 450 million miles apart in space, have not appeared this close together from Earth's vantage point since 1623, and it's been nearly 800 years since the alignment occurred at night. The conjunction, which occurs on the night of the winter solstice by coincidence, has become known popularly as the "Christmas Star." The gas giants will not appear this close together again until 2080. (Photo by Rodin Eckenroth/Getty Images)
Jupiter and Saturn appear closer than they have for 800 years
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SANTA BARBARA, CALIFORNIA - DECEMBER 21: Jupiter (L) and Saturn appear about one-tenth of a degree apart during an astronomical event known as a Great Conjunction on December 21, 2020 in Santa Barbara, California. The planets, which remain about 450 million miles apart in space, have not appeared this close together from Earth's vantage point since 1623, and it's been nearly 800 years since the alignment occurred at night. The conjunction, which occurs on the night of the winter solstice by coincidence, has become known popularly as the "Christmas Star." The gas giants will not appear this close together again until 2080. (Photo by Rodin Eckenroth/Getty Images)
Jupiter and Saturn appear closer than they have for 800 years
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CNN  — 

Jupiter and Saturn, the two largest planets in our solar system, came closer together than they have been in 400 years on Monday.

This great conjunction made a bright splash in the night sky and was captured around the world in stunning images.

The alignment has been nicknamed the “Christmas Star” but the fact that this event is happening close to Christmas and during the winter solstice is pure coincidence.

The two largest planets in the solar system were just 0.1 degrees apart, or about one fifth of the diameter of the full moon, according to the Royal Astronomical Society in the United Kingdom.

Jupiter, left, and Saturn appear to the left of The STRAT Hotel, Casino & SkyPod Monday in Las Vegas.
Jupiter, left, and Saturn appear to the left of The STRAT Hotel, Casino & SkyPod Monday in Las Vegas.
Ethan Miller/Getty Images
Jupiter, left, and Saturn are seen Monday in Santa Barbara, California.
Jupiter, left, and Saturn are seen Monday in Santa Barbara, California.
Rodin Eckenroth/Getty Images

If you missed it Monday night or the sky wasn’t clear, fear not: The two planets only appear to move apart very slowly, and will still appear unusually close together in the coming days.

The best perspective is for those near the equator.

CAPE CANAVERAL, FLORIDA - MAY 30: In this SpaceX handout image, a Falcon 9 rocket carrying the company's Crew Dragon spacecraft launches on the Demo-2 mission to the International Space Station with NASA astronauts Robert Behnken and Douglas Hurley onboard at Launch Complex 39A May 30, 2020, at the Kennedy Space Center, Cape Canaveral, Florida. The Demo-2 mission is the first launch of a manned SpaceX Crew Dragon spacecraft. It was the first launch of an American crew from U.S. soil since the conclusion of the Space Shuttle program in 2011. (Photo by SpaceX via Getty Images)
CAPE CANAVERAL, FLORIDA - MAY 30: In this SpaceX handout image, a Falcon 9 rocket carrying the company's Crew Dragon spacecraft launches on the Demo-2 mission to the International Space Station with NASA astronauts Robert Behnken and Douglas Hurley onboard at Launch Complex 39A May 30, 2020, at the Kennedy Space Center, Cape Canaveral, Florida. The Demo-2 mission is the first launch of a manned SpaceX Crew Dragon spacecraft. It was the first launch of an American crew from U.S. soil since the conclusion of the Space Shuttle program in 2011. (Photo by SpaceX via Getty Images)
SpaceX/Getty Images

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Jupiter will appear brightest and be easily visible. On Monday, Jupiter overtook Saturn and will now appear above the slightly fainter Saturn.

While these two planets may appear close, it is only an optical effect. Jupiter and Saturn were around 500 million miles (800 million kilometers) apart on Monday, despite appearing to be almost next to each other from the Earth’s perspective.

Jupiter and Saturn are seen coming together in the sky over the sails of Brill Windmill in Brill, England.
Jupiter and Saturn are seen coming together in the sky over the sails of Brill Windmill in Brill, England.
Jim Dyson/Getty Images
Saturn and Jupiter, top center, are seen in the sky over Broadway in downtown Nashville, Tennessee.
Saturn and Jupiter, top center, are seen in the sky over Broadway in downtown Nashville, Tennessee.
Andrew Nelles/The Tennessean/Imagn Content Services

Exceptionally rare

Conjunctions that are this close are very unusual, according to the Royal Astronomical Society, and Jupiter and Saturn were last seen in such proximity in 1623. On that occasion, the two planets were close to the sun in the sky, so they would have been hard to pick out.

The last time the planets were both this close and so easy to see was in 1226, long before the invention of the telescope, the society added in a statement.

People are silhouetted against the sky at dusk as they watch the alignment Monday in Edgerton, Kansas.
People are silhouetted against the sky at dusk as they watch the alignment Monday in Edgerton, Kansas.
Charlie Riedel/AP
Jupiter, left, and Saturn appear about one-tenth of a degree apart above Mount Tamalpais on Monday in Larkspur, California.
Jupiter, left, and Saturn appear about one-tenth of a degree apart above Mount Tamalpais on Monday in Larkspur, California.
Justin Sullivan/Getty Images

If you missed this conjunction and want to see the planets with the same proximity, just higher in the sky, it won’t happen until March 15, 2080 – and then not again until after 2400.

You’ll be able to see it again tonight

Even if you missed Jupiter and Saturn at their closest alignment on Monday, over the next few days the planets will still be visible in the United States at twilight.

AMESBURY, ENGLAND - DECEMBER 22: The sun rises over Stonehenge, as people take part in a winter solstice ceremony at the ancient neolithic monument of Stonehenge near Amesbury on December 22, 2018 in Wiltshire, England. A large crowd gathered at the famous historic stone circle, a UNESCO listed ancient monument to celebrate the sunrise closest to the Winter Solstice, the shortest day of the year. The event is claimed to be more important in the pagan calendar than the summer solstice, because it marks the 're-birth' of the Sun for the New Year. (Photo by Matt Cardy/Getty Images)
AMESBURY, ENGLAND - DECEMBER 22: The sun rises over Stonehenge, as people take part in a winter solstice ceremony at the ancient neolithic monument of Stonehenge near Amesbury on December 22, 2018 in Wiltshire, England. A large crowd gathered at the famous historic stone circle, a UNESCO listed ancient monument to celebrate the sunrise closest to the Winter Solstice, the shortest day of the year. The event is claimed to be more important in the pagan calendar than the summer solstice, because it marks the 're-birth' of the Sun for the New Year. (Photo by Matt Cardy/Getty Images)
Matt Cardy/Getty Images

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The further north you are the less time you’ll have to catch a glimpse of the conjunction before the planets sink below the horizon, said astronomer Patrick Hartigan, a professor of physics and astronomy at Rice University in Houston.

In the UK, it is important to find a line of sight without tall buildings or trees that will block the view with the planets low in the southwest after sunset, the Royal Astronomical Society said.

With the naked eye, the planets will appear as two bright points of light. Binoculars will show those points as slightly larger dots: Viewers may also be able to make out the four largest moons of Jupiter, and possibly Saturn’s largest moon, Titan.

With a small telescope the two planets will be in the same field of view, an exceptionally rare event, and the cloud belts on Jupiter and the rings of Saturn should be visible.