Martian fans will need to break out their New Year champagne a bit early in 2022.
The new year on Mars started today (Dec. 26), NASA said, days after the Perseverance rover set a milestone on the Red Planet by depositing two caches of material that will be used in a future sample return mission.
"No, we're not accidentally celebrating early," the NASA Mars Twitter account joked, referring to the Gregorian calendar that most of the world follows; that system's new year will click over as usual on Jan. 1. (Your tradition may have different new years, however.)
NASA and several other space agencies are roaming the surface of the Red Planet in search of signs of ancient life, which will culminate in a joint NASA-European sample return mission that could ferry regolith back in the 2030s.
Related: 12 amazing photos from the Perseverance rover's 1st year on Mars
The first Mars flyby was by Mariner 4 on July 14, 1965, but for the Red Planet new year scientists start counting from when the planet reached its northern spring equinox in 1955. "An arbitrary point to begin, but it’s useful to have a system," NASA officials wrote on Twitter.
"Numbering Mars years," they added, "helps scientists keep track of long term observations, like weather data collected by NASA spacecraft over the decades."
Since Mars is further from the sun than Earth, it takes roughly twice as long for the Red Planet to circle our sun. A Mars year is 687 days long and incidentally, the last time we rang in the new year on the Red Planet, Perseverance hadn't even landed yet.
The car sized-rover touched down on Feb. 18, 2021, about 11 days after the last Martian new year was celebrated. Besides leaving lightsaber-shaped caches on the planet's surface, a companion helicopter called Ingenuity has already completed 37 flights and is expected to take to the skies again soon.
Elizabeth Howell is the co-author of "Why Am I Taller?" (ECW Press, 2022; with Canadian astronaut Dave Williams), a book about space medicine. Follow her on Twitter @howellspace. Follow us on Twitter @Spacedotcom or Facebook.
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