Time measurement and standards |
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Major subjects | Time · Chronometry · Orders of magnitude · Units of time · Metrology |
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International standards | UTC · UT · TAI · ISO 31-1 · Second · DUT1 · Leap second · IERS
Terrestrial Time · Geocentric Coordinate Time · Barycentric Coordinate Time
Civil time · Minute · Hour · 12-hour clock · 24-hour clock · ISO 8601
International Date Line · Solar time · Time zone · Daylight saving time · Time offset |
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Obsolete standards | Ephemeris time · Barycentric Dynamical Time · Greenwich Mean Time · Prime Meridian |
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Time in physics | Spacetime · Chronon ·Cosmological decade · Planck epoch · Planck time · T-symmetry
Theory of relativity · Time dilation · Gravitational time dilation · Coordinate time · Proper time
Time domain · Continuous time · Discrete time · Absolute time and space |
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Horology | Clock · Astrarium · Atomic clock · Hourglass · Marine chronometer · Radio clock · Sundial · Watch · Water clock
History of timekeeping devices · Equation of time · Complication |
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Calendar | Day · Week · Month · Year · Decade · Century · Millennium
Astronomical · Julian · Gregorian · Islamic · Lunisolar · Solar · Lunar · Epact · Intercalation · Leap year
Tropical year · Equinox · Solstice · Days of the week · Calculating the day of the week · Dominical letter |
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Archaeology & geology | International Commission on Stratigraphy · Geologic Time · Archaeological dating |
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Astronomical chronology | Nuclear time scale · Precession · Sidereal time · Galactic year |
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Unusual units | Fortnight · Jiffy · Lustrum · Saeculum · Shake · Tide |
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Related topics | Chronology · Duration · System time · Metric time · Mental chronometry · Time value of money · Timekeeper |