Epoch (astronomy)
In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as the celestial coordinates or elliptical orbital elements of a celestial body, because these are subject to perturbations and vary with time. These time-varying astronomical quantities might include, for example, the mean longitude or mean anomaly of a body, the node of its orbit relative to a reference plane, the direction of the apogee or aphelion of its orbit, or the size of the major axis of its orbit.
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Epoch (astronomy)
In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as the celestial coordinates or elliptical orbital elements of a celestial body, because these are subject to perturbations and vary with time. These time-varying astronomical quantities might include, for example, the mean longitude or mean anomaly of a body, the node of its orbit relative to a reference plane, the direction of the apogee or aphelion of its orbit, or the size of the major axis of its orbit.
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Als Epoche (von griechisch επο ...... ten oder Ephemeriden beziehen.
@de
Een epoche is een bepaalde tij ...... en voor standaardepoche J2000.
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Em astronomia, época é um mome ...... o do eixo maior de sua órbita.
@pt
En astronomie, une époque est ...... temps atomique international).
@fr
En astronomía, época, o tambié ...... nte de tiempo para su cálculo.
@es
Epoka – punkt w czasie, dla kt ...... ułamkowym, np. 00001.50000000
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In astronomia, un'epoca è un i ...... loro telescopi con precisione.
@it
In astronomy, an epoch is a mo ...... to a different date and time).
@en
Эпоха в астрономии — момент вр ...... ы для других моментов времени.
@ru
حقبة في الفلك (بالإنجليزية: Ep ...... كواكب والنجوم تتغير مع الزمن .
@ar
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the mentioned cultural and cal ...... h of the day" to refer to them
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Als Epoche (von griechisch επο ...... ten oder Ephemeriden beziehen.
@de
Een epoche is een bepaalde tij ...... g eens door hun eigenbeweging.
@nl
Em astronomia, época é um mome ...... o do eixo maior de sua órbita.
@pt
En astronomie, une époque est ...... mais varie au cours du temps.
@fr
En astronomía, época, o tambié ...... nte de tiempo para su cálculo.
@es
Epoka – punkt w czasie, dla kt ...... ch, następnie zaś juliańskich.
@pl
In astronomia, un'epoca è un i ...... ti possono essere di due tipi:
@it
In astronomy, an epoch is a mo ...... f the major axis of its orbit.
@en
Эпоха в астрономии — момент вр ...... ы для других моментов времени.
@ru
حقبة في الفلك (بالإنجليزية: Ep ...... كواكب والنجوم تتغير مع الزمن .
@ar
label
Epoca (astronomia)
@it
Epoch (astronomy)
@en
Epoche (Astronomie)
@de
Epoche (astronomie)
@nl
Epoka (astronomia)
@pl
Época (astronomia)
@pt
Época (astronomía)
@es
Époque (astronomie)
@fr
Эпоха (астрономия)
@ru
حقبة (فلك)
@ar