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Mars’s northern spring brings a new year on 30 September, though a Martian year lasts nearly twice as long as one on Earth.
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The calendar turns at the northern equinox, which marks the start of spring in Mars’s northern hemisphere and autumn in its southern hemisphere. The European Space Agency (ESA) puts the start of Martian year 39 at 08:16 UTC on Wednesday, 30 September. [1]
A year on Mars lasts about 687 Earth days, or 668 Martian days, known as sols. Each sol is about 24 hours and 39 minutes long. ESA’s numbering convention for Martian years begins in 1955. [1]
The next turn of the Martian calendar is due on 17 August 2028, when Martian year 40 begins. [1]
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