What is the essential characteristic of the CEO?

As the true equator moves in space, the path of the CEO in space is such that the point has no instantaneous east-west velocity along the true equator. In contrast, the equinox has instantaneous velocity along the equator. After 1 century, the CEO is still within 70 mas of the ICRS prime meridian, whereas the equinox has moved nearly 1.4 degrees.