[time-nuts] Crude Survey Technique
Chris Howard
chris at elfpen.com
Thu Nov 21 20:08:37 EST 2013
Southward (toward equator) deflection would actually improve
the geometry. All non-north vectors would
be lengthened in proportion.
On 11/21/2013 6:37 PM, Bill Beam wrote:
> 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
>
>
>
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