When the information are dependent for their values on a particular coordinate process, the date of that coordinate process should be specified specifically or indirectly.There exists a Unique which means on the expression "equinox (and ecliptic/equator) of day". When coordinates are expressed as polynomials in time relative to a reference body out

Hence a particular coordinate process (equinox and equator/ecliptic of a particular date, for example J2000.0) may very well be made use of eternally, but a list of osculating elements for a specific epoch could only be (roughly) valid for your somewhat limited time, simply because osculating features which include These exampled higher than never