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ISO 31-1 is the part of international standard ISO 31 that defines names and symbols for quantities and units related to space and time. Its definitions include: Annex A of ISO 31-1 lists units of space and time based on the foot, pound and second. Annex B lists some other non-SI units of space and time, namely the gon, light year, astronomical unit, parsec, tropical year, and gal.
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