[extropy-chat] Astronomical question

[spike]

This is not right.


>  The Oxford Dictionary of Astronomy confirms that the
> earth/moon process eventually stops, and adds some
> interesting details that address long-term results:
> 
> "Over long periods of time tidal friction [induced by
> the moon] decreases the Earth's rate of spin, so
> lengthening the day. In turn, the Moon has angular
> momentum added to it in its orbit and gradually
> spirals away from the Earth. Ultimately, when the day
> equals the Moon's orbital period (each being about 40
> times the length of the present day) the process will
> cease. 

I agree to here.


> A new process will then begin in which the
> Sun's tide-raising power takes angular momentum from
> the Earth-Moon system. The Moon will then spiral in
> closer to the Earth until it is torn to pieces when it
> enters the Earth's Roche limit." (page 461)
> 
> ~Ian


I have checked my calcs and I can't find the error.
The sun tide effect is not sufficient to draw the
moon all the way back down to the Roche limit, not
even all that close.  

Anyone else calc differently?

spike