Jupiter and Saturn, the two largest planets in our solar system, were visibly closer on Monday night than they were in 800 years – marking an extremely rare celestial event known as “great conjunction. ”
The conjunction occurs when the orbits of the two planets align every 20 years, but the event is not always visible, and the planets do not usually meet as close as on December 21.
This time, Jupiter and Saturn were only 0.1 degrees apart – less than the diameter of the full moon.
The planets were so close that, from some perspectives, they seemed to overlap completely, creating a rare “double planet” effect. However, while the planets appeared from Earth to be very, very close, in reality, they are still hundreds of millions of kilometers away.
The event coincided with the winter solstice and the week of Christmas, but can take place at any time of the year.
If you missed the show or if your sky appeared cloudy on Monday night, don’t worry – the planets will still appear extremely close in the night sky in the next few weeks, and dedicated astrophotographers share their best photos of the night’s social media.
Santa Barbara, California
Rodin Eckenroth / Getty Images
Los Angeles California
PATRICK T. FALLON / AFP through Getty Images
Melbourne, Australia
Guatemala
Francisco Sojuel / NASA Astronomical image of the day
New York, New York
Gary Hershorn / Getty Images
Texas
Alborz Mountains, Iran
Alireza Vafa / NASA Astronomical image of the day
Koh Chang, Thailand
Chakarin Wattanamongkol / Getty Images
Brill, England
Jim Dyson / Getty Images
Colorado Springs, Colorado
Kuwait City, Kuwait
YASSER AL-ZAYYAT / AFP via Getty Images
How to follow the great conjunction
The great conjunction shines shortly after sunset, low in the southwestern sky, as seen from the northern hemisphere, NASA said.
Throughout December and early January, observers in the sky can easily observe the two planets with the naked eye. They are so bright that they are even visible in most cities.
Jupiter now looks brighter than any star in the sky. Saturn is slightly weaker, but still as bright as the brightest stars, with a recognized golden glow.
Saturn will appear slightly above and to the right of Jupiter and even looks as close to the planet as some of its own moons, visible through binoculars or a telescope. Unlike the twinkling stars, both planets will keep a constant brightness, easy to find on clear nights.
The event is observable from anywhere on Earth, provided the sky is clear. It is the easiest to observe along the equator, becoming more difficult to see further north.