[time-nuts] Crude Survey Technique

[Bill Beam]

On Thu, 21 Nov 2013 15:28:32 -0800, Chris Albertson wrote:

>If you need a very tall pole that is 100% vertical then hang a
>weighted rope from a tall support.  Then go to the other end and watch
>the seconds tick down.


Be carefull!...  A plumb bob does not hang vertically (point to center of Earth).
Since the suspension point is undergoing accelerated motion the bob will be
deflected toword the equator.  This problem also applies to bubble levels, etc.
And there are other perturbations due to Sun, Moon, Jupiter, etc. which are not constant.
Which leads to the question:  How to make the pole vertical?

Newtons laws are NOT valid in a noninertial frame.  (That's why the Coriolis force
was invented.)

Thus the term "rocket science".


Bill Beam
NL7F