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- Epoch_(astronomy) abstract "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.The main use of astronomical quantities specified in this way is to calculate other relevant parameters of motion, in order to predict future positions and velocities. The applied tools of the disciplines of celestial mechanics or its subfield orbital mechanics (for predicting orbital paths and positions for bodies in motion under the gravitational effects of other bodies) can be used to generate an ephemeris, a table of values giving the positions and velocities of astronomical objects in the sky at a given time or times.Astronomical quantities can be specified in any of several ways, for example, as a polynomial function of the time-interval, with an epoch as a temporal point of origin (this is a common current way of using an epoch). Alternatively, the time-varying astronomical quantity can be expressed as a constant, equal to the measure that it had at the epoch, leaving its variation over time to be specified in some other way—for example, by a table, as was common during the 17th and 18th centuries.The word epoch was often used in a different way in older astronomical literature, e.g. during the 18th century, in connection with astronomical tables. At that time, it was customary to denote as "epochs", not the standard date and time of origin for time-varying astronomical quantities, but rather the values at that date and time of those time-varying quantities themselves. In accordance with that alternative historical usage, an expression such as 'correcting the epochs' would refer to the adjustment, usually by a small amount, of the values of the tabulated astronomical quantities applicable to a fixed standard date and time of reference (and not, as might be expected from current usage, to a change from one date and time of reference to a different date and time).".
- Epoch_(astronomy) wikiPageExternalLink ICRS_doc.html.
- Epoch_(astronomy) wikiPageExternalLink TT.html.
- Epoch_(astronomy) wikiPageExternalLink MainDisp.csl?pid=46-25776.
- Epoch_(astronomy) wikiPageID "200006".
- Epoch_(astronomy) wikiPageLength "22474".
- Epoch_(astronomy) wikiPageOutDegree "85".
- Epoch_(astronomy) wikiPageRevisionID "668202209".
- Epoch_(astronomy) wikiPageWikiLink 5145_Pholus.
- Epoch_(astronomy) wikiPageWikiLink Aberration_of_light.
- Epoch_(astronomy) wikiPageWikiLink Apogee.
- Epoch_(astronomy) wikiPageWikiLink Apsis.
- Epoch_(astronomy) wikiPageWikiLink Astrometry.
- Epoch_(astronomy) wikiPageWikiLink Astronomical_object.
- Epoch_(astronomy) wikiPageWikiLink Astronomy.
- Epoch_(astronomy) wikiPageWikiLink Axial_precession.
- Epoch_(astronomy) wikiPageWikiLink Category:Astronomical_epochs.
- Epoch_(astronomy) wikiPageWikiLink Celestial_coordinate_system.
- Epoch_(astronomy) wikiPageWikiLink Celestial_coordinates.
- Epoch_(astronomy) wikiPageWikiLink Celestial_mechanics.
- Epoch_(astronomy) wikiPageWikiLink Civil_time.
- Epoch_(astronomy) wikiPageWikiLink Constellation.
- Epoch_(astronomy) wikiPageWikiLink Coordinated_Universal_Time.
- Epoch_(astronomy) wikiPageWikiLink Day.
- Epoch_(astronomy) wikiPageWikiLink DeltaT.
- Epoch_(astronomy) wikiPageWikiLink Earth.
- Epoch_(astronomy) wikiPageWikiLink Ecliptic.
- Epoch_(astronomy) wikiPageWikiLink Ecliptic_coordinate_system.
- Epoch_(astronomy) wikiPageWikiLink Ephemeris.
- Epoch_(astronomy) wikiPageWikiLink Epoch_(reference_date).
- Epoch_(astronomy) wikiPageWikiLink Equator.
- Epoch_(astronomy) wikiPageWikiLink Equatorial_coordinate_system.
- Epoch_(astronomy) wikiPageWikiLink Equinox_(celestial_coordinates).
- Epoch_(astronomy) wikiPageWikiLink Friedrich_Bessel.
- Epoch_(astronomy) wikiPageWikiLink Greenwich_Mean_Time.
- Epoch_(astronomy) wikiPageWikiLink Gregorian_calendar.
- Epoch_(astronomy) wikiPageWikiLink Gregorian_date.
- Epoch_(astronomy) wikiPageWikiLink Gregorian_year.
- Epoch_(astronomy) wikiPageWikiLink Hebrew_calendar.
- Epoch_(astronomy) wikiPageWikiLink Heliacal_rising.
- Epoch_(astronomy) wikiPageWikiLink Henry_Draper_Catalog.
- Epoch_(astronomy) wikiPageWikiLink Henry_Draper_Catalogue.
- Epoch_(astronomy) wikiPageWikiLink Hipparcos.
- Epoch_(astronomy) wikiPageWikiLink IAU.
- Epoch_(astronomy) wikiPageWikiLink Infinity.
- Epoch_(astronomy) wikiPageWikiLink International_Astronomical_Union.
- Epoch_(astronomy) wikiPageWikiLink International_Atomic_Time.
- Epoch_(astronomy) wikiPageWikiLink International_Celestial_Reference_Frame.
- Epoch_(astronomy) wikiPageWikiLink International_Celestial_Reference_System.
- Epoch_(astronomy) wikiPageWikiLink Islamic_calendar.
- Epoch_(astronomy) wikiPageWikiLink Julian_calendar.
- Epoch_(astronomy) wikiPageWikiLink Julian_date.
- Epoch_(astronomy) wikiPageWikiLink Julian_day.
- Epoch_(astronomy) wikiPageWikiLink Julian_year_(astronomy).
- Epoch_(astronomy) wikiPageWikiLink Longitude_of_the_ascending_node.
- Epoch_(astronomy) wikiPageWikiLink Lunar_calendar.
- Epoch_(astronomy) wikiPageWikiLink Lunisolar_calendar.
- Epoch_(astronomy) wikiPageWikiLink Major_axis.
- Epoch_(astronomy) wikiPageWikiLink March_equinox.
- Epoch_(astronomy) wikiPageWikiLink Mean_anomaly.
- Epoch_(astronomy) wikiPageWikiLink Mean_longitude.
- Epoch_(astronomy) wikiPageWikiLink Meridian_(astronomy).
- Epoch_(astronomy) wikiPageWikiLink Midnight.
- Epoch_(astronomy) wikiPageWikiLink Minor_planet.
- Epoch_(astronomy) wikiPageWikiLink Noon.
- Epoch_(astronomy) wikiPageWikiLink Orbital_elements.
- Epoch_(astronomy) wikiPageWikiLink Orbital_mechanics.
- Epoch_(astronomy) wikiPageWikiLink Osculating_elements.
- Epoch_(astronomy) wikiPageWikiLink Osculating_orbit.
- Epoch_(astronomy) wikiPageWikiLink Perihelion_and_aphelion.
- Epoch_(astronomy) wikiPageWikiLink Perturbation_(astronomy).
- Epoch_(astronomy) wikiPageWikiLink Plane_of_reference.
- Epoch_(astronomy) wikiPageWikiLink Polynomial.
- Epoch_(astronomy) wikiPageWikiLink Precession.
- Epoch_(astronomy) wikiPageWikiLink Precession_of_the_equinoxes.
- Epoch_(astronomy) wikiPageWikiLink Proper_motion.
- Epoch_(astronomy) wikiPageWikiLink Reference_plane.
- Epoch_(astronomy) wikiPageWikiLink SOFA_(astronomy).
- Epoch_(astronomy) wikiPageWikiLink Semi-major_axis.
- Epoch_(astronomy) wikiPageWikiLink Sirius.
- Epoch_(astronomy) wikiPageWikiLink Sun.
- Epoch_(astronomy) wikiPageWikiLink Tabulae_Caelestes.
- Epoch_(astronomy) wikiPageWikiLink Terrestrial_Time.
- Epoch_(astronomy) wikiPageWikiLink UT1.
- Epoch_(astronomy) wikiPageWikiLink Universal_Time.
- Epoch_(astronomy) wikiPageWikiLink Vernal_equinox.
- Epoch_(astronomy) wikiPageWikiLink Year.
- Epoch_(astronomy) wikiPageWikiLink ΔT.
- Epoch_(astronomy) wikiPageWikiLinkText "''epoch'' year".
- Epoch_(astronomy) wikiPageWikiLinkText "1875.0".
- Epoch_(astronomy) wikiPageWikiLinkText "2000.0".
- Epoch_(astronomy) wikiPageWikiLinkText "B".
- Epoch_(astronomy) wikiPageWikiLinkText "B1900.0".
- Epoch_(astronomy) wikiPageWikiLinkText "B1950.0 / (J2000.0)".
- Epoch_(astronomy) wikiPageWikiLinkText "B1950.0 epoch".
- Epoch_(astronomy) wikiPageWikiLinkText "B1950.0".
- Epoch_(astronomy) wikiPageWikiLinkText "Besselian Epochs".
- Epoch_(astronomy) wikiPageWikiLinkText "Epoch (astronomy)".
- Epoch_(astronomy) wikiPageWikiLinkText "Epoch (astronomy)#Besselian years".
- Epoch_(astronomy) wikiPageWikiLinkText "Epoch (astronomy)#J2000.0".