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Wednesday 10 October 2012

Units Of Time


UnitSizeNotes
yoctosecond10−24 s
zeptosecond10−21 s
attosecond10−18 sshortest time uncertainty
in present measurements
femtosecond10−15 spulse time of ultrafast lasers
(100 as = 0.1 fs)
picosecond10−12 s
nanosecond10−9 stime for molecules to fluoresce
microsecond10−6 s
millisecond0.001 s
second1 s base unit
minute60 seconds
hour60 minutes
day24 hours
week7 daysAlso called sennight
fortnight14 days2 weeks
lunar month27.2–29.5 daysVarious definitions exist.
month28–31 days
quarter3 months
year12 months
common year365 days52 weeks + 1 day
leap year366 days52 weeks + 2 days
tropical year365.24219 daysaverage
Gregorian year365.2425 daysaverage
Olympiad4 year cycle
lustrum5 yearsAlso called pentad
decade10 years
Indiction15 year cycle
generation17–35 yearsapproximate
jubilee (Biblical)50 years
century100 years
millennium1,000 years
exasecond1018 sroughly 32 billion years, more than twice
the age of the universe on current estimates
cosmological decadevaries10 times the length of the previous
cosmological decade, with CÐ 1 beginning
either 10 seconds or 10 years after the
Big Bang, depending on the definition.

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