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Frank wrote:

> My question is, with various revisions and
> refinements in the geodetic system,  is that precisely true today?
> That is, does zero degrees longitude still pass  right through that
> transit instrument's original mounting point by  definition?

Nice question, Frank. In the local paper recently came across an assertion
that the northern orbital axis of the earth (ie; the North Pole) had been
found to have moved some small (less than the five and a half nautical miles
cited by Frank) distance 'to the east'.

Hmmm. Shouldn't any movement away from the North Pole be necessarily to the
south?

Anyhow, I would imagine that this, if true, would mean that all the lines of
longitude and latitude would need adjustment. This matter is quite separate
to, and presumably has no connection with, the movement of the magnetic
poles.

   

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