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The length of time for Mars to complete one orbit around the Sun in respect to the stars, its sidereal year, is about 686.98 Earth solar days (≈ 1.88 Earth years), or 668.5991 sols. Because of the eccentricity of Mars' orbit, the seasons are not of equal length.
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 .
the Sol system: 668 sols per Mars Year. This system consists of uniform time units. However, Mars Year sols may be confused with rover mission times that are also expressed in sols. Unlike in the day vs. sol distinction, "Mars Year" has no unique Latin term. Start and End dates of Mars Years were determined for 1607–2141 by Piqueux et al. [2 ...
January 18, 2025 at 9:00 AM ... rocks could reveal details about potential past life on the Red Planet – but first NASA has to get them back to Earth. For years, ... 2024, the 1,354th Martian ...
360-day calendar used for accounting; 365-day calendar used for accounting; Unix time, number of seconds elapsed since 1 January 1970, 00:00:00 (UTC). Julian day, number of days elapsed since 1 January 4713 BC, 12:00:00 (UTC). Heliocentric Julian Date, Julian day corrected for differences in the Earth's position with respect to the Sun.
For example, January is the first month symbolized by the number 1, February is the second month ruled by the number 2, and so on. ... You can work these out with your Destiny Number and plan the ...
The Revised Julian and Gregorian calendars will differ by a day. [163] ≈2750 4772 October 13 The Mesoamerican Long Count calendar, assuming a turnover value of 20 b'ak'tuns, will require a sixth order. 2,884 4909 The Gregorian calendar will be a full day ahead of the solar year. 3,984 6009 The first Strobogrammatic numbered year since 1961 ...