Ephemeris time
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: 1.
* a former standard astronomical time scale adopted in 1952 by the IAU, and superseded in the 1970s.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: ). 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. 2.
* a modern relativistic coordinate time sca
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Ephemeris time
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: 1.
* a former standard astronomical time scale adopted in 1952 by the IAU, and superseded in the 1970s.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: ). 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. 2.
* a modern relativistic coordinate time sca
has abstract
Czas efemeryd (ET) jest wyznac ...... taki sam jak czas uniwersalny.
@pl
Die 1960 eingeführte Zeitskala ...... der heutigen Sekunde abgelöst.
@de
El tiempo de efemérides es una ...... tre es altamente impredecible.
@es
Il tempo effemeride (ET) detto ...... essere assunta come costante.
@it
Le temps des éphémérides (TE) ...... n actuelle : mieux que 10-13).
@fr
The term ephemeris time (often ...... ndard SI second (see below: ).
@en
Эфемери́дное вре́мя, ET — равн ...... ен — это идеальное построение.
@ru
暦表時(れきひょうじ、Ephemeris Time, ET) ...... ては、時刻系#惑星運動の計算に用いられる時刻系を参照のこと。
@ja
曆書時(ET)是過去用於天體的星曆表中,特別是太陽(從地球觀 ...... 1960年和1984年之間的國際單位秒被定義成和原子秒一致。
@zh
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Czas efemeryd (ET) jest wyznac ...... taki sam jak czas uniwersalny.
@pl
Die 1960 eingeführte Zeitskala ...... nschaften und der Messtechnik.
@de
El tiempo de efemérides es una ...... una diferencia de 62 segundos.
@es
Il tempo effemeride (ET) detto ...... tempo terrestre (TT) nel 1991.
@it
Le temps des éphémérides (TE) ...... te (le temps universel ou UT).
@fr
The term ephemeris time (often ...... lativistic coordinate time sca
@en
Эфемери́дное вре́мя, ET — равн ...... нила шкала TT земного времени.
@ru
暦表時(れきひょうじ、Ephemeris Time, ET) ...... ては、時刻系#惑星運動の計算に用いられる時刻系を参照のこと。
@ja
曆書時(ET)是過去用於天體的星曆表中,特別是太陽(從地球觀 ...... 1960年和1984年之間的國際單位秒被定義成和原子秒一致。
@zh
label
Czas efemeryd
@pl
Ephemeridenzeit
@de
Ephemeris time
@en
Tempo effemeride
@it
Temps des éphémérides
@fr
Tiempo de efemérides
@es
Эфемеридное время
@ru
暦表時
@ja
曆書時
@zh