altitude data?

Clearly my references are 2-4 billion years out of date. But, in any case, this means that there's a more dense, possibly irregular, object in the center of the earth which is not rigidly attached to the surface. People think it's rotating relative to the surface at about a degree/year, too, which implies that any theologically significant point on it moves under the surface by about 66 miles every year (in some direction).