The orientation of the BCRS / ICRS axes also align within 0.02 arcsecond of the Earth's mean equator and equinox for the Fifth Fundamental Catalog ( FK5 ) J2000.0 epoch.
2.
Technically, this is different from, but similar to, the International Celestial Reference System ( ICRS ) : the mean equator and equinox at J2000.0 are distinct from and of lower precision than ICRS, but agree with ICRS to the limited precision of the former.
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