Mean Equinox J2000.0: Confirm Ecliptic Plane Intersection

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The discussion seeks confirmation on whether the ecliptic plane for J2000.0 intersects the center of mass of the Sun, the center of mass of the Earth, and the center of mass of the Earth at a specific date and time. Users express confusion regarding the term "Mean Equinox at Epoch J2000.0" and the lack of clear definitions available from authoritative sources. Experiments conducted with Celestia appear to support the intersection claim, but definitive answers remain elusive. The IERS website is mentioned as unhelpful in providing the necessary information. Ultimately, the consensus is that a clear answer may not exist, highlighting the complexity of the topic.
WildEnergy
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Hi

I can't find a clear answer to this anywhere.

Can anybody confirm that the ecliptic plane for J2000.0 intersects these 3 points:

a) center of mass of sun @ J2000.0
b) center of mass of Earth @ J2000.0
c) center of mass of Earth @ 20 March 2000 07:35 UTC

Experiments with Celestia seem to confirm this.

But I am confused by the phrase "Mean Equinox at Epoch J2000.0"

Also does anybody know where to find the official definition?
Looking around the IERS website - never seem to find the actual full answer.
 
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all this is deprecated now, as explained by this PDF:
http://syrte.obspm.fr/iau/iauWGnfa/wallace_com8_ga06.pdf"
the reason I could find no answer - is because there is no answer
 
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