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Darian calendar. The Darian calendar is a proposed system of timekeeping designed to serve the needs of any possible future human settlers on the planet Mars. It was created by aerospace engineer, political scientist, and space jurist Thomas Gangale in 1985 and named by him after his son Darius.
Mars' Calendar. Time on Mars is easily divided into days based on its rotation rate and years based on its orbit. Sols, or Martian solar days, are only 39 minutes and 35 seconds longer than Earth days, and there are 668 sols (687 Earth days) in a Martian year.
The Martian year corresponding to 1609/1610 is highly significant in the history of Mars. During this Martian year, Johannes Kepler published his first two laws of planetary motion. His work included years of studying the orbit of Mars in particular.
Each martian year has 668.5907 martian days. To have an accurate calendar, leap years are added. In 10 years, there will be 6 years of 669-day-year (leap year), and 4 years of 668-day-year (common year). The leap years are the years that are even and are divisible by 10.
Timekeeping on Mars. (In red) Martian season lengths and time as compared to seasons on Earth (in blue), with marks for the vernal equinox, perihelion, and aphelion. Though no standard exists, numerous calendars and other timekeeping approaches have been proposed for the planet Mars.
months to fill a tropical Martian year that begins at the vernal equinox. The Zubrin calendar also uses a tropical year that starts at the vernal equinox but uses 12 nonuniform months. The two uniform calendars have been criticized for choosing the vernal equinox as their defining point
The Martian Common Era Calendar. No human has ever walked on Mars, and yet people have been designing Martian calendars for more than a century now! In fact, there have been at least 70 different calendars proposed, and none of these is official. It's a challenging and fun problem, and it's never too early to think about these things.
