Thus a selected coordinate method (equinox and equator/ecliptic of a specific date, such as J2000.0) might be utilised permanently, but a list of osculating elements for a certain epoch may only be (somewhere around) valid to get a rather minimal time, since osculating factors including Individuals exampled previously mentioned tend not to clearly

If some time change is small, then fairly uncomplicated and small corrections for the precession may well suffice. If some time variation gets huge, then fuller and even more correct corrections must be utilized. Due to this, a star placement examine from the star atlas or catalog according to a sufficiently old equinox and equator can not be used