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- Q2460513 subject Q7476780.
- Q2460513 abstract "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 TT.".
- Q2460513 wikiPageExternalLink tai.
- Q2460513 wikiPageExternalLink glossary.htm.
- Q2460513 wikiPageExternalLink MainDisp.csl?pid=98-134.
- Q2460513 wikiPageWikiLink Q1056595.
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- Q2460513 wikiPageWikiLink Q21994628.
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- Q2460513 wikiPageWikiLink Q2460513.
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- Q2460513 wikiPageWikiLink Q333.
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- Q2460513 wikiPageWikiLink Q4360.
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- Q2460513 wikiPageWikiLink Q4866000.
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- Q2460513 wikiPageWikiLink Q6313217.
- Q2460513 wikiPageWikiLink Q6867.
- Q2460513 wikiPageWikiLink Q7476780.
- Q2460513 wikiPageWikiLink Q772096.
- Q2460513 wikiPageWikiLink Q874572.
- Q2460513 wikiPageWikiLink Q908676.
- Q2460513 comment "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).".
- Q2460513 label "Terrestrial Time".