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- Time_standard abstract "A time standard is a specification for measuring time: either the rate at which time passes; or points in time; or both. In modern times, several time specifications have been officially recognized as standards, where formerly they were matters of custom and practice. An example of a kind of time standard can be a time scale, specifying a method for measuring divisions of time. A standard for civil time can specify both time intervals and time-of-day.Standardized time measurements are made using a clock to count periods of some cyclic change, which may be either the changes of a natural phenomenon or of an artificial machine.Historically, time standards were often based on the Earth's rotational period. From the late 17th century to the 19th century it was assumed that the Earth's daily rotational rate was constant. Astronomical observations of several kinds, including eclipse records, studied in the 19th century, raised suspicions that the rate at which Earth rotates is gradually slowing and also shows small-scale irregularities, and this was confirmed in the early twentieth century. Time standards based on Earth rotation were replaced (or initially supplemented) for astronomical use from 1952 onwards by an ephemeris time standard based on the Earth's orbital period and in practice on the motion of the Moon. The invention in 1955 of the caesium atomic clock has led to the replacement of older and purely astronomical time standards, for most practical purposes, by newer time standards based wholly or partly on atomic time.Various types of second and day are used as the basic time interval for most time scales. Other intervals of time (minutes, hours, and years) are usually defined in terms of these two.".
- Time_standard wikiPageExternalLink leapsec.html.
- Time_standard wikiPageExternalLink tai.html.
- Time_standard wikiPageExternalLink timer.pl.
- Time_standard wikiPageExternalLink systime.html.
- Time_standard wikiPageExternalLink clock_comparisons.html.
- Time_standard wikiPageExternalLink times.html.
- Time_standard wikiPageExternalLink article.cfm?id=experts-time-division-days-hours-minutes.
- Time_standard wikiPageExternalLink timescales.html.
- Time_standard wikiPageID "41799".
- Time_standard wikiPageLength "16861".
- Time_standard wikiPageOutDegree "76".
- Time_standard wikiPageRevisionID "671111806".
- Time_standard wikiPageWikiLink Atomic_clock.
- Time_standard wikiPageWikiLink Atomic_time.
- Time_standard wikiPageWikiLink Barycentric_Coordinate_Time.
- Time_standard wikiPageWikiLink Barycentric_Dynamical_Time.
- Time_standard wikiPageWikiLink Category:Time_scales.
- Time_standard wikiPageWikiLink Civil_time.
- Time_standard wikiPageWikiLink Clock.
- Time_standard wikiPageWikiLink Coordinate_time.
- Time_standard wikiPageWikiLink Coordinated_Universal_Time.
- Time_standard wikiPageWikiLink DE405.
- Time_standard wikiPageWikiLink Day.
- Time_standard wikiPageWikiLink Daylight_saving_time.
- Time_standard wikiPageWikiLink Dynamical_time_scale.
- Time_standard wikiPageWikiLink Ecliptic.
- Time_standard wikiPageWikiLink Ephemeris_time.
- Time_standard wikiPageWikiLink Equation_of_time.
- Time_standard wikiPageWikiLink Geocentric_Coordinate_Time.
- Time_standard wikiPageWikiLink Greenwich_Mean_Time.
- Time_standard wikiPageWikiLink Hour.
- Time_standard wikiPageWikiLink IAU.
- Time_standard wikiPageWikiLink International_Astronomical_Union.
- Time_standard wikiPageWikiLink International_Atomic_Time.
- Time_standard wikiPageWikiLink International_Meridian_Conference.
- Time_standard wikiPageWikiLink International_System_of_Units.
- Time_standard wikiPageWikiLink Jet_Propulsion_Laboratory.
- Time_standard wikiPageWikiLink Jet_Propulsion_Laboratory_Development_Ephemeris.
- Time_standard wikiPageWikiLink Julian_day.
- Time_standard wikiPageWikiLink Leap_second.
- Time_standard wikiPageWikiLink Mean_solar_time.
- Time_standard wikiPageWikiLink Meridian_(geography).
- Time_standard wikiPageWikiLink Minute.
- Time_standard wikiPageWikiLink Nadir.
- Time_standard wikiPageWikiLink Orbital_period.
- Time_standard wikiPageWikiLink Prime_Meridian.
- Time_standard wikiPageWikiLink Prime_meridian.
- Time_standard wikiPageWikiLink Radio_clock.
- Time_standard wikiPageWikiLink Rate_(mathematics).
- Time_standard wikiPageWikiLink Royal_Greenwich_Observatory.
- Time_standard wikiPageWikiLink Royal_Observatory,_Greenwich.
- Time_standard wikiPageWikiLink SI.
- Time_standard wikiPageWikiLink Second.
- Time_standard wikiPageWikiLink Sidereal_time.
- Time_standard wikiPageWikiLink Solar_time.
- Time_standard wikiPageWikiLink Standard_time.
- Time_standard wikiPageWikiLink Standardization.
- Time_standard wikiPageWikiLink Terrestrial_Dynamical_Time.
- Time_standard wikiPageWikiLink Terrestrial_Time.
- Time_standard wikiPageWikiLink Time.
- Time_standard wikiPageWikiLink Time_signal.
- Time_standard wikiPageWikiLink Time_zone.
- Time_standard wikiPageWikiLink UT1.
- Time_standard wikiPageWikiLink United_States_Naval_Observatory.
- Time_standard wikiPageWikiLink Universal_Time.
- Time_standard wikiPageWikiLink Year.
- Time_standard wikiPageWikiLinkText "Time scales".
- Time_standard wikiPageWikiLinkText "Time standard".
- Time_standard wikiPageWikiLinkText "temporal interval".
- Time_standard wikiPageWikiLinkText "time scale".
- Time_standard wikiPageWikiLinkText "time standard".
- Time_standard wikiPageWikiLinkText "time".
- Time_standard wikiPageWikiLinkText "timing".
- Time_standard wikiPageWikiLinkText "unit of time".
- Time_standard hasPhotoCollection Time_standard.
- Time_standard wikiPageUsesTemplate Template:Anchor.
- Time_standard wikiPageUsesTemplate Template:Reflist.
- Time_standard wikiPageUsesTemplate Template:Time_Topics.
- Time_standard wikiPageUsesTemplate Template:Time_measurement_and_standards.
- Time_standard wikiPageUsesTemplate Template:Timezones.
- Time_standard subject Category:Time_scales.
- Time_standard hypernym Specification.
- Time_standard type Software.
- Time_standard comment "A time standard is a specification for measuring time: either the rate at which time passes; or points in time; or both. In modern times, several time specifications have been officially recognized as standards, where formerly they were matters of custom and practice. An example of a kind of time standard can be a time scale, specifying a method for measuring divisions of time.".
- Time_standard label "Time standard".
- Time_standard sameAs Zeitskala.
- Time_standard sameAs Tidsstandard.
- Time_standard sameAs Zeitskala.
- Time_standard sameAs Estándar_de_tiempo.
- Time_standard sameAs Aikajärjestelmä.
- Time_standard sameAs 時刻系.
- Time_standard sameAs m.0bh8f.
- Time_standard sameAs Q6313217.
- Time_standard sameAs Q6313217.
- Time_standard sameAs 時間標準.
- Time_standard wasDerivedFrom Time_standard?oldid=671111806.
- Time_standard isPrimaryTopicOf Time_standard.