Mean Equinox J2000.0: Confirm Ecliptic Plane Intersection

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In summary, a user is looking for confirmation that the ecliptic plane for J2000.0 intersects the center of mass of the sun, Earth, and Earth at 20 March 2000 07:35 UTC. They have experimented with Celestia and believe it to be true, but are confused about the phrase "Mean Equinox at Epoch J2000.0". They are also searching for the official definition, but have not been able to find it on the IERS website. It is mentioned that this information is now deprecated, as explained in a PDF, and that there is no available answer.
  • #1
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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  • #2
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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1. What is the Mean Equinox J2000.0?

The Mean Equinox J2000.0 is a reference point used in astronomy to define the position of objects in the sky. It is the mean position of the equinox at the beginning of the year 2000 and is used as a standard reference point for measuring celestial coordinates.

2. Why is the Mean Equinox J2000.0 important?

The Mean Equinox J2000.0 is important because it provides a fixed reference point for measuring the positions of celestial objects. It allows astronomers to accurately track and compare the movements of objects in the sky over time.

3. What is the Ecliptic Plane?

The Ecliptic Plane is the imaginary plane that represents the apparent path of the Sun as seen from Earth. It is tilted at an angle of 23.5 degrees to the celestial equator and is used as a reference for measuring the positions of other celestial objects.

4. What is the intersection of the Mean Equinox J2000.0 and the Ecliptic Plane?

The intersection of the Mean Equinox J2000.0 and the Ecliptic Plane is the point where the equator and the ecliptic plane meet. This point is used as a reference for measuring the celestial coordinates of objects in the sky.

5. How is the Mean Equinox J2000.0 and the Ecliptic Plane intersection confirmed?

The Mean Equinox J2000.0 and the Ecliptic Plane intersection is confirmed through observations and calculations made by astronomers. They use various techniques such as astrometry and celestial mechanics to accurately determine the position of the intersection and confirm its accuracy.

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