[time-nuts] finding time astronomically.

[Poul-Henning Kamp]

In message <4F1DD9D3.6050003 at earthlink.net>, Jim Lux writes:
>On 1/23/12 1:20 PM, Doug Millar wrote:

>> A mercury mirror is better than a plumb bob.

But not much.

Both of them are subject to aberations of the local gravity vector
(any mountains, valleys near by ?) and in the case of a rotating
liquid metal mirror to a lesser degree to interaction with the earths
magnetic field.

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