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It is approximately 24 hours, 39 minutes, 35 seconds long. 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. [2] [3]
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] Whereas previous proposals for a Martian calendar had not included an epoch, American astronomer I. M. Levitt developed a more complete system in 1954.
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).
Illustrates the range of a Martian period of time or a Martian event, the geological range of a stratigraphic unit, or other ranges on a geological timescale. Intended for use in infoboxes. For the full earth counterpart of this template, see {{Long fossil range}}. For Proterozoic ages, see {{Proterozoic time scale}}.
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[19] [20] The main feature that separates Survivalcraft 2 from its predecessor is the existence of "furnitures", a system that allows players to make their own block by using an in-game tool called an iron hammer. [21] An update for Survivalcraft 2 added multiplayer—a long-awaited feature—into the game. [9]