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Darian calendar
The Darian calendar is a proposed system of time-keeping designed to serve the needs of any possible future human settlers on the planet Mars. It was created by aerospace engineer and political scientist Thomas Gangale in 1985 and named by him after his son Darius. It was first published in June 1986.〔Gangale, Thomas. (1986-06-01). "Martian Standard Time". ''Journal of the British Interplanetary Society.'' Vol. 39, No. 6, p. 282-288.〕
==Year length and intercalation==
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, which is slightly different from the tropical 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. The basic intercalation formula therefore allocates six 669-sol years and four 668-sol years to each Martian decade. The former (still called leap years even though they are more common than non-leap years) are years that are either odd (not evenly divisible by 2) or else are evenly divisible by 10, producing 6,686 sols per ten years (668.6 sols per year).
A 1998 iteration of the Darian calendar made years divisible by 100 common years, but years divisible by 500 stay leap years.〔Gangale, Thomas. (1998-08-01). "The Darian Calendar". Mars Society. MAR 98-095. ''Proceedings of the Founding Convention of the Mars Society.'' Volume III. Ed. Robert M. Zubrin, Maggie Zubrin. San Diego, California. Univelt, Incorporated. 13-Aug-1998.〕 However, this static intercalation scheme did not take into account the slowly increasing length of the Martian vernal equinox year. In 2006 Gangale devised a series of intercalation formulas, all of which have in common the basic decennial cycle, as shown in the following table:
This extended intercalation scheme results in an error of only about one sol at the end of 12,000 Martian years, or about the year 24,180 of the Common Era.〔Gangale, Thomas. (2006-07-01). "The Architecture of Time, Part 2: The Darian System for Mars." Society of Automotive Engineers. SAE 2006-01-2249.〕
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