>>  I'm looking forwards to the day when they discover the point beyond
>>    which all subsequent digits of Pi are zero :-)
>
>Already here.  The point at which that happens, however, depends on the
>accuracy you can measure with.  If your limit is measuring one cycle of
>earth's orbit to within 1mm, then the zeros start at the 16th digit past
>the decimal point.  In other words Pi =
>3.1415926535897930000000000000000000000000000...  And even if I'm wrong,
>the point is you can't tell.

I believe that 5 decimal places is enough to calculate the circumference of 
the earth to within a handspan. Sorry don't have a reference, I just 
remember being told it at one stage. 

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