Re: accruate "sundials"


"Paul Schlyter" <pausch@xxxxxxx> wrote in message
news:1119439990.cc3bcd73dd3081fcbb10e7671777428b@xxxxxxxxxxx
> > Yes, please, would someone tell me how we could measure this rotation
> > without refernce to any other body?
>
> Actually, there is a way to do that: measure the coriolis force of a
> body which moves on a surface. The surface must be horizontal and
> smoot, and the body must be a sphere. Preferably the experiment should
> be conducted in a vacuum. And the experiment should be performed at a
> high latitude - ideally at the north pole, but in practice 40-60 deg
> latitude will do. The measured rotation rate will be the vertical
> component of the rotation vector, whose magnitude is the rotation rate
> multiplied with the sine of the latitude.
>

Are you sure this is correct?

I am no expert on the Coriolis effect, but if you had the earth in space as
it is, rotating relative to the sun, and then suddenly, by some magical
means, removed EVERYTHING but the earth from the universe, would the
Coriolis effect still be observed?


.

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