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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 Clancy Mars year is reckoned from one Martian northward equinox to the next (L s = 0°), and specific dates within a given year are expressed in L s. The Clancy Mars year count is approximately equal to the Darian year count minus 183. The Allison Mars sol date epoch equates to L s = 276.6° in a year that is undefined in the Clancy Mars ...
The most commonly seen in the scientific literature denotes the time of year as the number of degrees on its orbit from the northward equinox, and increasingly there is use of numbering the Martian years beginning at the equinox that occurred April 11, 1955. [1] [2] Mars has an axial tilt and a rotation period similar to those of Earth.
gives 4398 sols since the Mars Science Laboratory landed on Mars; This template was created for use on Mars mission pages, NASA ones in particular, which identify mission milestones based on the mission sol which begins with sol 0 on the landing date for rover and landers and the orbital insertion date for orbiters.
A single official calendar for Mars does not yet exist, so a numbered Mars day, known as a "Sol", is used in the calculation. NASA or another authoritative agency determines the Sol number for the new event on Mars by counting Sols from the beginning of the mission. The Mars clock time of the event is determined by geographic location and sun ...
These geomorphic features suggest Mars had an ocean on its surface and river networks that resemble current Earth's during the late Noachian (4.1–3.7 Ga). [ 37 ] [ 38 ] It is unclear how Mars's orbital pattern, which places it even further from the Sun, and the faintness of the young Sun could have produced what is thought to have been a very ...
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in summary, "if you plug the time and date UT 2021-02-18 13:50:00 into an Mars2020 timekeeping calculation, you should obtain that it is mission time 00:00 on Sol 0. If you're off by a second or two, you're doing as well as Mars24.