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In each quarter there are three months of 42 sols and a fourth month of 41 sols. The pattern of seven-day weeks repeats over a two-year cycle, i.e., the calendar year always begins on a Sunday in odd-numbered years, thus effecting a perpetual calendar for Mars. [27]
The basic time periods from which the calendar is constructed are the Martian solar day (sometimes called a sol) and the Martian vernal equinox year.The sol is 39 minutes 35.244 seconds longer than the Terrestrial solar day, and the Martian vernal equinox year is 668.5907 sols in length (which corresponds to 686.9711 days on Earth).
A Martian year is approximately 668.6 sols, equivalent to approximately 687 Earth days [1] or 1.88 Earth years. The sol was adopted in 1976 during the Viking Lander missions and is a measure of time mainly used by NASA when, for example, scheduling the use of a Mars rover .
This is an accepted version of this page This is the latest accepted revision, reviewed on 12 February 2025. Scientific projections regarding the far future Several terms redirect here. For other uses, see List of numbers and List of years. Artist's concept of the Earth 5–7.5 billion years from now, when the Sun has become a red giant While the future cannot be predicted with certainty ...
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Curiosity rover on Mars (5 August 2015). The Mars Science Laboratory and its rover, Curiosity, were launched from Earth on 26 November 2011. As of January 24, 2025, Curiosity has been on the planet Mars for 4432 sols (4554 total days; 12 years, 171 days) since landing on 6 August 2012.
Currently, a return journey to Mars can take up to two years, with crew members having to wait a full year for the planets to realign, but with ion propulsion -- which uses electricity to ...
At the end of the day, if people decide they actually want to commit themselves to the New Year's resolutions they set in 2025, things will look very different than the numbers shared here.