| Deutsche Version |  |
 |
| Fractions of a second | Metric name |
| 0.000 000 000 000 000 000 000 001 | yoctosecond [ ys ] |
| 0.000 000 000 000 000 000 001 | zeptosecond [ zs ] |
| 0.000 000 000 000 000 001 | attosecond [ as ] |
| 0.000 000 000 000 001 | femtosecond [ fs ] |
| 0.000 000 000 001 [ trillionth ] | picosecond [ ps ] |
| 0.000 000 001 [ billionth ] | nanosecond [ ns ] |
| 0.000 001 [ millionth ] | microsecond [µs ] |
| 0.001 [ thousandth ] | millisecond [ ms ] |
| 0.01 [ hundredth ] | centisecond [ cs ] |
| 1.0 | second [ s ] |
| Seconds to years | |
| 60 seconds | = 1 minute [ mean solar ] |
| 59.83617 seconds | = 1 minute [ sidereal ] |
| 60 minutes | = 1 hour |
| 24 hours | = 1 day |
| 3,600 seconds | = 1 hour |
| 86,400 seconds | = 1 day [ mean solar ] |
| 86,164.09 seconds | = 1 day [ sidereal ] |
| 7 days | = 1 week |
| 168 hours | = 1 week |
| 14 days | = 1 fortnight |
| 28, 29, 30 or 31 days | = 1 month |
| 365 days | = 1 year |
| 366 days | = 1 leap year |
| 12 months | = 1 year |
| 31,536,000 seconds | = 1 year [ calendar ] |
| 31,558,150 seconds | = 1 year [ sidereal ] |
| 31,556,930 seconds | = 1 year [ tropical ] |
| 9,460,550,000,000,000 metres | = 1 light year |
| 299,792,458 metres per second ( m/s ) | = speed of light |
| parsec | = approx. 3.25 light years |
| Year intervals - anniversaries | Number of years |
| Biennial | 2 |
| Triennial | 3 |
| Quadrennial | 4 |
| Quinquennial | 5 |
| Hexennial | 6 |
| Septennial | 7 |
| Octennial | 8 |
| Novennial | 9 |
| Decennial | 10 |
| Hendecennial | 11 |
| Duodecennial | 12 |
| Tredecennial | 13 |
| Quindecennial | 15 |
| Sextodecennial | 16 |
| Septendecennial | 17 |
| Vigintennial | 20 |
| Trigentennial | 30 |
| Quadragennial | 40 |
| Quinquagenary | 50 |
| Sexagennial | 60 |
| Septuagennial | 70 |
| Septuagesiquintennial | 75 |
| Octogintennial | 80 |
| Nonagintennial | 90 |
| Centennial | 100 |
| Quasquicentennial | 125 |
| Sesquicentennial | 150 |
| Terquasquicentennial or Septaquintaquinquecentennial |
175 |
| Bicentennial | 200 |
| Quasquibicentennial | 225 |
| Semiquincentennial | 250 |
| Tercentennial | 300 |
| Semiseptcentennial | 350 |
| Quatercentenary | 400 |
| Quincentennial | 500 |
| Sexcentennial | 600 |
| Septcentennial | 700 |
| Octocentennial | 800 |
| Millenial | 1,000 |
| Quindecimillenial | 15,000 |
Time conversion chart
| Convert from: | to: | multiply by: |
| day (d) | second (s) | 8.64 E+04 |
| day (sidereal) | second (s) | 8.616409 E+04 |
| hour (h) | second (s) | 3.6 E+03 |
| hour (sidereal) | second (s) | 3.590170 E+03 |
| minute (min) | second (s) | 6.0 E+01 |
| minute (sidereal) | second (s) | 5.983617 E+01 |
| second (sidereal) | second (s) | 9.972696 E-01 |
| shake | second (s) | 1.0 E-08 |
| shake | nanosecond (ns) | 1.0 E+01 |
| year (365 days) | second (s) | 3.1536 E+07 |
| year (sidereal) | second (s) | 3.155815 E+07 |
| year (tropical) | second (s) | 3.155693 E+07 |
| 1 mean solar unit = 1.00273791 sidereal units 1 sidereal unit = 0.99726957 mean solar unit 1 microsecond = 0.000001 second 1 second = 1,000,000 microseconds = 0.01666667 minute = 0.00027778 hour = 0.00001157 day 1 minute= 60 seconds = 0.01666667 hour = 0.00069444 day 1 hour = 3,600 seconds = 60 minutes = 0.04166667 day 1 mean solar day = 24h 03m 56s55536 of mean sidereal time = 1 rotation of earth with respect to sun (mean) = 1.00273791 rotations of earth w/respect to Aries (mean) = 1.0027378118868 rotations of earth w/respect to stars(mean) 1 mean sidereal day = 23h 56m 04s09054 of mean solar time 1 sidereal month = 27.321661 days = 27d 07h 43m 11s5 1 synodical month = 29.530588 days = 29d 12h 44m 02s8 1 tropical (normal) year = 31,556,925.975 seconds = 525,948.766 minutes = 8,765.8128 hours = 365d.242198 -0d.0000000614(t-1900), where t = the year = 365d 05h 48m 46s (-) 0s 0053t 1 sidereal year = 365d.25636042+0.0000000011(t-1900), where t = the year = 365d 06h 09m 09s.5 (+) 0s.0001t 1 normal calendar year = 31,536,000 seconds = 525,600 minutes = 8,760 hours = 365 days 1 calendar year (leap) = 31,622,400 seconds = 528,040 minutes = 8,784 hours = 366 days 1 light-year = 9,460,000,000,000 kilometers = 5,880,000,000,000 statute miles = 5,110,000,000,000 nautical miles = 63,240 astronomical units = 0.3066 parsecs 1 parsec = 30,860,000,000,000 kilometers = 19,170,000,000,000 statute miles = 16,660,000,000,000 NM = 206,300 astronomical units = 3.262 light years 1 astronomical unit = 149,600,000 kilometers = 92,960,000 statute miles = 80,780,000 nautical miles = 499s.012 light-time = mean distance, earth to sun Mean distance earth-moon = 384,400 kilometers = 238,855 statute miles = 207,559 nautical miles Mean distance earth to sun = 149,600,000 kilometers = 92,957,000 statute miles = 80,780,000 nautical miles = 1 astronomical unit Sun's diameter = 1,392,000 kilometer = 865,000 statute miles = 752,000 nautical miles Speed of sun relative to neighbouring stars= 19.4 kilometers per second = 12.1 statute miles per second = 10.5 nautical miles per second Orbital speed of earth = 29.8 kilometers per second = 18.5 statute miles per second = 16.1 nautical miles per second Obliquity of the ecliptic = 23º 27' 08".26 - 0".4684 (t - 1900), where t = the year General precession of the equinoxes = 50".2564 + 0".000222 (t - 1900) per year, where t = the year Precession of the equinoxes in right ascension = 46".0850 + 0".000279 (t - 1900) per year, where t = the year Precession of the equinoxes in declination = 20".0468-0".000085 (t - 1900) per year, where t = the year |
| Name of time unit, t | Symbol | Definition | Relation to SI unit s |
| second | s | - | second = SI base unit |
| Planck time | - | ≡ √(Gℏ/c5) | ≈ 1.351 211 818×10−43 s |
| atomic unit of time | au | ≡ a0/(α·c) | ≈ 2.418 884 254×10−17 s |
| svedberg | S | ≡ 10−13 s | = 100 fs |
| shake | - | ≡ 10−8 s | = 10 ns |
| sigma | - | ≡ 10−6 s | = 1 μs |
| jiffy | - | ≡ 1/60 s | ≈ 16.666 667 ms |
| jiffy (alternate) | - | ≡ 1/100 s | ≈ 10 ms |
| helek | - | ≡ 1/1080 h | ≈ 3.333333 s |
| minute | min | ≡ 60 s | |
| moment | - | ≡ 90 s | ≡ 90 s |
| ke (traditional) | - | ≡ 1/100 d | ≡ 864 s |
| quarter (of an h) | ke | ≡ 1/96 d | ≡ 900 s |
| hour | h | ≡ 60 min | = 3600 s |
| day | d | ≡ 24 h | = 86 400 s |
| week | wk | ≡ 7 d | = 604 800 s |
| fortnight | - | ≡ 2 wk | = 1 209 600 s |
| month (hollow) | mo | ≡ 29 d | = 2 505 600 s |
| month | mo | ≡ 30 d | = 2 592 000 s |
| month (full) | mo | ≡ 31 d | = 2 678 400 s |
| year (Calendar) | a or y | ≡ 365 d | = 31 536 000 s |
| year (Gregorian) | a or y | ≡ 365.2425 d | = 31 556 952 s |
| year (Julian) | a or y | ≡ 365.25 d | = 31 557 600 s |
| sideral year | a or y | ≡ 365.256363 d | = 31 558 149.76 s |
| Olympiad | - | ≡ 4 a of 365 d | = 1.2614×108 s |
| lustre; lustrum | - | ≡ 5 a of 365 d | = 1.5768×108 s |
| octaeteris | - | ≡ 8 a of 365 d | = 2.522 88×108 s |
| decade | - | ≡ 10 a of 365 d | = 3.1536×108 s |
| enneade caeteris; Metonic cycle | - | ≡110 mo (hollow) + 125 mo (full) = 19 a of 365 d |
= 5.996 16×108 s |
| Callippic cycle | - | ≡441 mo (hollow) + 499 mo (full) = 76 a of 365.25 d |
= 2.398 377 6×109 s |
| century (Calendar) | - | ≡ 100 a of 365 d | = 3.1536×109 s |
| century (Julian) | - | ≡ 100 a of 365.25 d | = 3.155 76×109 s |
| Hipparchic cycle | - | ≡ 4 Callippic cycles - 1 d | = 9.593 424×109 s |
| millennium (Calendar) | - | ≡ 1000 a of 365 d | = 3.1536×1010 s |
| millennium (Gregorian) | - | ≡ 1000 a of 365.2425 d | = 3.155 695 2×1010 s |
| millennium (Julian) | - | ≡ 1000 a of 365.25 d | = 3.155 76×1010 s |
| Sothic cycle | - | ≡ 1461 a of 365 d | = 4.607 409 6×1010 s |
back  |
next  |
home  |