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Terrestrial Time (TT) is a modern astronomical time standard defined by the International Astronomical Union, primarily for time-measurements of astronomical observations made from the surface of Earth.For example, the Astronomical Almanac uses TT for its tables of positions (ephemerides) of the Sun, Moon and planets as seen from Earth. In this role, TT continues Terrestrial Dynamical Time (TDT), which in turn succeeded ephemeris time (ET). TT shares the original purpose for which ET was designed, to be free of the irregularities in the rotation of Earth.

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  • Terrestrial Time
  • Tempo Terrestre
  • Temps terrestre
  • Земное время
  • 地球時
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  • Le temps terrestre (TT) est une échelle de temps idéale établie à partir du Temps atomique international (TAI). TT = TAI + 32,184s. * Portail de la physique Portail de la physique
  • 地球時(英语:Terrestrial Time),簡稱TT,是現代在地球表面上的時間標準,是位於大地海平面體驗的原時。在天文學,则為侷限在地球上的觀測者顯示星曆表的時間座標。它與地心座標時(Geocentric Coordinate Time)有直接的關聯,是天文的地球系統時間標準。由於廣義相對論中的引力時間膨脹,地球時的滴答聲是恒定的比例,並且比地心座標時緩慢些。
  • Terrestrial Time (TT) is a modern astronomical time standard defined by the International Astronomical Union, primarily for time-measurements of astronomical observations made from the surface of Earth.For example, the Astronomical Almanac uses TT for its tables of positions (ephemerides) of the Sun, Moon and planets as seen from Earth. In this role, TT continues Terrestrial Dynamical Time (TDT), which in turn succeeded ephemeris time (ET). TT shares the original purpose for which ET was designed, to be free of the irregularities in the rotation of Earth.
  • Il Tempo Terrestre (TT) — o Tempo Dinamico Terrestre (TDT) come si chiamava fino al 1991 — è la scala di tempo moderna, introdotta in luogo del Tempo Effemeride, nel 1976 dalla Unione Astronomica Internazionale (IAU), come coordinate temporale consistente con la relatività generale per un osservatore sulla superficie della Terra. Per scopi pratici, TT può essere calcolato tramite la formula: TT = TAI +32,184 s
  • Земное время, Terrestrial Time (ТТ) — современный астрономический стандарт, разработанный Международным астрономическим союзом для определения времени астрономических наблюдений, сделанных с поверхности Земли. Земное время является наследником динамического времени и эфемеридного времени. Земное время отличается от шкалы времени, используемого для повседневного применения (UTC). Единица времени TT — секунды в системе СИ, основанные на стандарте цезиевых атомных часов.
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  • Terrestrial Time (TT) is a modern astronomical time standard defined by the International Astronomical Union, primarily for time-measurements of astronomical observations made from the surface of Earth.For example, the Astronomical Almanac uses TT for its tables of positions (ephemerides) of the Sun, Moon and planets as seen from Earth. In this role, TT continues Terrestrial Dynamical Time (TDT), which in turn succeeded ephemeris time (ET). TT shares the original purpose for which ET was designed, to be free of the irregularities in the rotation of Earth. The unit of TT is the SI second, the definition of which is currently based on the caesium atomic clock, but TT is not itself defined by atomic clocks. It is a theoretical ideal, which real clocks can only approximate. TT is distinct from the time scale often used as a basis for civil purposes, Coordinated Universal Time (UTC). TT indirectly underlies UTC, via International Atomic Time (TAI). Each leap second that is introduced into UTC causes UTC to diverge a little further from TAI but limits the difference between UTC and TT.
  • Le temps terrestre (TT) est une échelle de temps idéale établie à partir du Temps atomique international (TAI). TT = TAI + 32,184s. * Portail de la physique Portail de la physique
  • Il Tempo Terrestre (TT) — o Tempo Dinamico Terrestre (TDT) come si chiamava fino al 1991 — è la scala di tempo moderna, introdotta in luogo del Tempo Effemeride, nel 1976 dalla Unione Astronomica Internazionale (IAU), come coordinate temporale consistente con la relatività generale per un osservatore sulla superficie della Terra. Per scopi pratici, TT può essere calcolato tramite la formula: TT = TAI +32,184 s La IAU riconosce che TAI è una scala statistica del tempo che ha cambiato spesso le regole per la sua costruzione durante la sua storia. Per questo motivo, le comunità scientifiche internazionali stanno preparando una nuova scala temporale basata su osservazioni di alcune pulsar. Questa scala dovrebbe servire per calcolare TT ed eventualmente per scoprire irregolarità in TAI.
  • 地球時(英语:Terrestrial Time),簡稱TT,是現代在地球表面上的時間標準,是位於大地海平面體驗的原時。在天文學,则為侷限在地球上的觀測者顯示星曆表的時間座標。它與地心座標時(Geocentric Coordinate Time)有直接的關聯,是天文的地球系統時間標準。由於廣義相對論中的引力時間膨脹,地球時的滴答聲是恒定的比例,並且比地心座標時緩慢些。
  • Земное время, Terrestrial Time (ТТ) — современный астрономический стандарт, разработанный Международным астрономическим союзом для определения времени астрономических наблюдений, сделанных с поверхности Земли. Земное время является наследником динамического времени и эфемеридного времени. Земное время отличается от шкалы времени, используемого для повседневного применения (UTC). Единица времени TT — секунды в системе СИ, основанные на стандарте цезиевых атомных часов. Краткого обзора TT, данного ниже, достаточно для миллисекундных точностей измерений. Полное текущее определение TT вовлекает теорию относительности.
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