Standard unit of time measurement on Earth determined by the average length of the planet's solar orbit. The year is divided up into 365.2425 planetary rotations which are in turn grouped into twelve months, most lasting 30 or 31 days. Although Mars still uses the Standard Earth Year for timekeeping, the orbital period of Mars is equal to 1.88 Earth Years and as such local seasonal cycles, such as the Martian winter are measured from that period.
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