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the claim

A Martian year lasts about 687 Earth days.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
2 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that a Martian year lasts about 687 Earth days?

Yes. Two independent reference sources state that a Martian year lasts about 687 Earth days: a Wikipedia article on timekeeping on Mars gives a sidereal year of about 686.98 Earth days, and a Caltech report on the Mars Observer mission equates one Martian year with 687 Earth days.

Verdict: SUPPORTED · 2 sources for, 0 against · Last checked

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Evidence for · 2
Timekeeping on Mars - Wikipedia
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Timekeeping on Mars - Wikipedia. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Timekeeping_on_Mars

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More for · 1
Mars Observer's Global Mapping Mission
1990
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L., A. A. & F., P. D. (1990). Mars Observer's Global Mapping Mission. authors.library.caltech.edu. https://doi.org/10.1029/EO071i039p01099-01

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