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- Ephemeris_time abstract "The term ephemeris time (often abbreviated ET) can in principle refer to time in connection with any astronomical ephemeris. In practice it has been used more specifically to refer to: a former standard astronomical time scale adopted in 1952 by the IAU, and superseded in the 1970s. This time scale was proposed in 1948, to overcome the drawbacks of irregularly fluctuating mean solar time. The intent was to define a uniform time (as far as was then feasible) based on Newtonian theory (see below: Definition of ephemeris time (1952)). Ephemeris time was a first application of the concept of a dynamical time scale, in which the time and time scale are defined implicitly, inferred from the observed position of an astronomical object via the dynamical theory of its motion. a modern relativistic coordinate time scale, implemented by the JPL ephemeris time argument Teph, in a series of numerically integrated Development Ephemerides. Among them is the DE405 ephemeris in widespread current use. The time scale represented by Teph is closely related to, but distinct (by an offset and constant rate) from, the TCB time scale currently adopted as a standard by the IAU (see below: JPL ephemeris time argument Teph).Most of the following sections relate to the ephemeris time of the 1952 standard.An impression has sometimes arisen that ephemeris time was in use from 1900: this probably arose because ET, though proposed and adopted in the period 1948–1952, was defined in detail using formulae that made retrospective use of the epoch date of 1900 January 0 and of Newcomb's Tables of the Sun.The ephemeris time of the 1952 standard leaves a continuing legacy, through its ephemeris second which became closely duplicated in the length of the current standard SI second (see below: Redefinition of the second).".
- Ephemeris_time wikiPageExternalLink 1939MNRAS..99..541S.
- Ephemeris_time wikiPageExternalLink 1984RSPTA.313...47S.
- Ephemeris_time wikiPageExternalLink 1988A%26A...194..304G.
- Ephemeris_time wikiPageExternalLink 1995RSPTA.351..165S.
- Ephemeris_time wikiPageExternalLink 1959AJ.....64..106M.
- Ephemeris_time wikiPageExternalLink 1927BAN.....4...21D.
- Ephemeris_time wikiPageExternalLink 1948AJ.....53..169C.
- Ephemeris_time wikiPageExternalLink 1955AJ.....60R.171M.
- Ephemeris_time wikiPageExternalLink 1971JHA.....2...73C.
- Ephemeris_time wikiPageExternalLink 1977AJ.....82...84W.
- Ephemeris_time wikiPageExternalLink 1988IAUS..128..413M.
- Ephemeris_time wikiPageExternalLink 1998A%26A...336..381S.
- Ephemeris_time wikiPageExternalLink 2004JHA....35..327M.
- Ephemeris_time wikiPageExternalLink 2005JHA....36..339M.
- Ephemeris_time wikiPageExternalLink books?id=uJ4JhGJANb4C.
- Ephemeris_time wikiPageExternalLink IAU1976_French.pdf.
- Ephemeris_time wikiPageExternalLink 1958-PhysRev-v1-n3-Markowitz-Hall-Essen-Parry.pdf.
- Ephemeris_time wikiPageID "9994".
- Ephemeris_time wikiPageRevisionID "542152877".
- Ephemeris_time hasPhotoCollection Ephemeris_time.
- Ephemeris_time subject Category:Time_in_astronomy.
- Ephemeris_time subject Category:Time_scales.
- Ephemeris_time comment "The term ephemeris time (often abbreviated ET) can in principle refer to time in connection with any astronomical ephemeris. In practice it has been used more specifically to refer to: a former standard astronomical time scale adopted in 1952 by the IAU, and superseded in the 1970s. This time scale was proposed in 1948, to overcome the drawbacks of irregularly fluctuating mean solar time.".
- Ephemeris_time label "Czas efemeryd".
- Ephemeris_time label "Ephemeridenzeit".
- Ephemeris_time label "Ephemeris time".
- Ephemeris_time label "Tempo effemeride".
- Ephemeris_time label "Temps des éphémérides".
- Ephemeris_time label "Tiempo de efemérides".
- Ephemeris_time label "Эфемеридное время".
- Ephemeris_time label "暦表時".
- Ephemeris_time label "曆書時".
- Ephemeris_time sameAs Ephemeridenzeit.
- Ephemeris_time sameAs Tiempo_de_efemérides.
- Ephemeris_time sameAs Temps_des_éphémérides.
- Ephemeris_time sameAs Waktu_Efemeris.
- Ephemeris_time sameAs Tempo_effemeride.
- Ephemeris_time sameAs 暦表時.
- Ephemeris_time sameAs 역표시.
- Ephemeris_time sameAs Czas_efemeryd.
- Ephemeris_time sameAs m.02qf3.
- Ephemeris_time sameAs Q908676.
- Ephemeris_time sameAs Q908676.
- Ephemeris_time wasDerivedFrom Ephemeris_time?oldid=542152877.
- Ephemeris_time isPrimaryTopicOf Ephemeris_time.