Unit of Time - List

List

Units of time
Unit Size Notes
Planck time unit 5.39 x 10–44 s The amount of time light takes to travel one Planck length. This is the shortest time unit possible to understand in physics. All smaller time units have no use in physics.
yoctosecond 10−24 s
jiffy (physics) ~3 × 10−24s The amount of time light takes to travel one fermi (about the size of a nucleon) in a vacuum.
zeptosecond 10−21 s
attosecond 10−18 s shortest time now measurable
femtosecond 10−15 s pulse time on fastest lasers
picosecond 10−12 s
nanosecond 10−9 s time for molecules to fluoresce
shake 10 nanoseconds Also a casual term for a short period of time
microsecond 10−6 s
millisecond 0.001 s
centisecond 0.01 s
decisecond 0.1 s
jiffy (electronics) ~1/50s to 1/60s Used to measure the time between alternating power cycles. Also a casual term for a short period of time
second 1 s SI base unit
dekasecond 10 seconds
minute 60 seconds
moment 90 seconds medieval unit of time
hectosecond 100 seconds 1 minute and 40 seconds
ke ~15 minutes
kilosecond 1,000 seconds 16 minutes and 40 seconds
hour 60 minutes
day 24 hours
week 7 days Also called sennight
megasecond 1 million seconds About 11.6 days
fortnight 14 days 2 weeks
lunar month 27.2–29.5 days Various definitions of lunar month exist.
month 28–31 days
quarter 3 months Also called season
year 12 months
common year 365 days 52 weeks + 1 day
tropical year 365.24219 days average
Gregorian year 365.2425 days average
sidereal year 365.256363004 days
leap year 366 days 52 weeks + 2 days
biennium 2 years A unit of time commonly used by legislatures
triennium 3 years
Olympiad 4 year cycle
lustrum 5 years Also called pentad
decade 10 years
Indiction 15 year cycle
generation 17–35 years approximate
gigasecond 1 billion seconds About 31.7 years
jubilee (Biblical) 50 years
century 100 years
millennium 1,000 years
terasecond 1 trillion seconds About 31,700 years
megaanum 1 million years
petasecond 1 quadrillion seconds About 31.7 million years
galactic year Approximately 230 million years The amount of time it takes the Solar System to orbit the center of the Milky Way Galaxy one time.
gigaanum 1 billion years
exasecond 1 quintillion seconds
teraanum 1 trillion years
zettasecond 1 sextillion seconds About 31.7 trillion years
petaanum 1 quadrillion years
yottasecond 1 septillion seconds About 31.7 quadrillion years
exaanum 1 quintillion years
zettaanum 1 sextillion years
yottaanum 1 septillion years
cosmological decade varies

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