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Converting Time Units
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Popular Units

 Unit Symbol Definition Conversion to SI units atomic unit of time au = a0/(a·c) ~ 2.418 884 254 x 10-17 s Callippic cycle = 441 mo (hollow) + 499 mo (full) = 76 a of 365.25 d = 2.398 3776 x 109 s century c = 100 a (see below for definition of year length) = 100 x year day d = 24 h = 86400 s day (sidereal) d = Time needed for the Earth to rotate once around its axis, determined from successive transits of a very distant astronomical object across an observer's meridian (International Celestial Reference Frame) ~ 86 164.1 s decade dec = 10 a (see below for definition of year length) = 10 x year fortnight fn = 2 wk = 1 209 600 s helek = 1/1 080 h = 3.3 s Hipparchic cycle = 4 Callippic cycles - 1 d = 9.593 424 x 109 s hour h = 60 min = 3 600 s jiffy j = 1/60 s = .016 s jiffy (alternate) ja = 1/100 s = 10 ms ke (quarter of an hour) = ¼ h = 1/96 d = 60 x 60 / 4 s = 900 s = 60 / 4 min = 15 min ke (traditional) = 1/100 d = 24 x 60 x 60 / 100 s = 864 s = 24 * 60 / 100 min = 14.4 min lustre; lustrum = 5 a of 365 d = 1.5768 x 108 s Metonic cycle; enneadecaeteris = 110 mo (hollow) + 125 mo (full) = 6940 d ~ 19 a = 5.996 16 x 108 s millennium = 1 000 a (see below for definition of year length) = 1000 x year milliday md = 1/1 000 d = 24 x 60 x 60 / 1 000 s = 86.4 s minute min = 60 s, due to leap seconds sometimes 59 s or 61 s, = 60 s moment = 90 s = 90 s month (full) mo = 30 d = 2 592 000 s month (Greg. av.) mo Average Gregorian month = 365.2425/12 d = 30.436875 d ~ 2.6297 x 106 s month (hollow) mo = 29 d = 2 505 600 s month (synodic) mo Cycle time of moon phases ~ 29.530589 days (Average) ~ 2.551 x 106 s octaeteris = 48 mo (full) + 48 mo (hollow) + 3 mo (full) = 8 a of 365.25 d = 2922 d = 2.524 608 x 108 s Planck time = (G?/c5)½ ~ 1.351 211 868 x 10-43 s second s time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 K (but other seconds are sometimes used in astronomy) (SI base unit) shake = 10-8 s = 10 ns sigma = 10-6 s = 1 µs Sothic cycle = 1 461 a of 365 d = 4.607 4096 x 1010 s svedberg S = 10-13 s = 100 fs week wk = 7 d = 604 800 s year (Gregorian) a, y, or yr = 365.2425 d average, calculated from common years (365 d) plus leap years (366 d) on most years divisible by 4. See leap year for details. = 31 556 952 s year (Julian) a, y, or yr = 365.25 d average, calculated from common years (365 d) plus one leap year (366 d) every four years = 31 557 600 s year (sidereal) a, y, or yr = time taken for Sun to return to the same position with respect to the stars of the celestial sphere ~ 365.256 363 d ~ 31 558 149.7632 s year (tropical) a, y, or yr = Length of time it takes for the Sun to return to the same position in the cycle of seasons ~ 365.242 190 d ~ 31 556 925 s Where UTC is observed, the length of time units longer than 1 s may increase or decrease by 1 s if a leap second occurs during the time interval of interest.
source: wikipedia

Convert From and To Units

 • 1/3 Year • Atomic unit of time • Beat • Blink • Century • Cosmic year • Day (d, da) • Fortnight • Francaide • Glass • Hour (h, hr) • Kilosecond • Lustrum • Megasecond (Ms) • Microsecond (µs) • Millenium • Millisecond (ms, msec) • Minute (min) • Nanosecond (ns) • Pikosecond • Quarter Hour • Second (s, sec) • Shake • Split second • Ten Years • Thousand Year • Watch • Week (wk) • Year
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