-> Sprotty fired back with hard evidence that the orientation used  
-> was excellent for the northern hemisphere - but useless for Down  
-> Under shepherds. The prof fumed in defense. 
  
Most northern dials would be useless in any orientation in the southern 
hemisphere. Up here, shadows move clockwise (which is probably why 
clocks are made to turn that way). Down there, shadows go 
anticlockwise. A trip around the universe might turn one into the 
other, but not much else. 
  
When I was in Chile a few years ago, I decided it would be fun to bring 
a southern-hemisphere sundial back to Canada. But such a thing was 
nowhere to be found. Nobody had ever heard of one. So I made one, and 
set it up in a friend's back yard in Santiago. His daughter took 
pictures and made it the subject of a school project. It led to great 
amazement. 
  
Only a very unusual kind of dial would be usable in both hemispheres, 
with appropriate adjustments. 
  
                      dow 
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