When the info are dependent for his or her values on a certain coordinate procedure, the date of that coordinate method has to be specified immediately or indirectly.So, some stellar positions read from a star atlas or catalog for any sufficiently aged epoch involve proper motion corrections too, for fair accuracy.Alternatively, some time-various a
When the data are dependent for their values on a selected coordinate method, the date of that coordinate process really should be specified immediately or indirectly.There's a Exclusive which means with the expression "equinox (and ecliptic/equator) of date". When coordinates are expressed as polynomials in time relative to your reference body out
Hence a selected coordinate method (equinox and equator/ecliptic of a selected date, which include J2000.0) could possibly be used for good, but a list of osculating features for a certain epoch may well only be (around) legitimate for your relatively restricted time, for the reason that osculating factors including These exampled over usually do n