Such as, orbital elements, Particularly osculating components for minor planets, are routinely supplied with reference to 2 dates: initially, relative to your recent epoch for all of the elements: but a number of the facts are depending on a selected coordinate system, and after that it can be typical to specify the coordinate program of a regular

Epoch vs . equinoxDate-references for coordinate systemsEpochs and durations of validityChanging the common equinox and epochSpecifying an epoch or equinoxBesselian yearsJulian years and J2000Epoch from the daySee alsoReferencesNotesCitationsSourcesFurther readingExternal back linksEven though a technique's conduct right after overflow occurs is no