Hence a specific coordinate system (equinox and equator/ecliptic of a selected day, such as J2000.0) can be used for good, but a list of osculating things for a particular epoch could only be (roughly) valid for just a fairly constrained time, because osculating elements which include People exampled over never present the outcome of long run pertu
By way of example, orbital things, In particular osculating things for insignificant planets, are routinely provided with reference to 2 dates: to start with, relative to a modern epoch for all of the elements: but some of the information are depending on a chosen coordinate process, and afterwards it truly is typical to specify the coordinate tech
Celestial coordinate techniques most commonly Utilized in astronomy are equatorial coordinates and ecliptic coordinates. These are described relative to your (moving) vernal equinox situation, which alone is decided because of the orientations of the Earth's rotation axis and orbit within the Solar. Their orientations vary (though slowly and gradua