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J2000 Epoch coordinates

Guest zidder

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The 2000 section refers to the year 2000 and it is a unit of time that the measurements of a celestial body can be found at that time frame.

The last epoch was B1950, so if you were to look at an object using the 1950 epoch, the right accession etc would be different if you used the current epoch. The object had not moved, just our point of reference due to the Earths wobble etc.

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The J2000 coordinates are based on the position of the vernal equinox in the year 2000 AD. The location of Earth on March 21, 2000 sets the position of the prime meridian. These are referred to as J2000 coordinates. As far as I'm aware the 2000 date is not important, it could have been any date.

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