Well, all sundials (except rare focusing dials) cast a shadow whose blurred 
edge is 2 minutes of time wide, corresponding to the 2 minute (of time) width 
of the sun.  This effect is just more noticable in large dials, but does not 
enhace or lessen their accuracy.
-Bill Gottesman, Burlington, VT

In a message dated 8/7/2001 5:20:45 PM Eastern Daylight Time, 
[EMAIL PROTECTED] writes:

> Hi Alexei, hi all,
>  
>  I think that an other problem of a large sundial, is the accuracy of the
>  shadow. Will the shadow be sufficiently "sharp" ?
>  
>  Good luck and sunny skies !
>  
>  Alain MORY
>  48°N7°E

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