question-of-the-day answered

[Rich Littleton]

Damned clever!

Thanks, Doug.

Rich

______________________________________________________________________

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On Wed, 6 Oct 1999, Doug Hathaway wrote:

> On Wed, 6 Oct 1999, Kurt Cockrum wrote:
> 
> > Rich said:
> > >Solution needed.
> > >
> > >If I have a styrofoam ball one foot in diameter, how can I find the
> > >precise location of the opposing poles?
> (snip)
> 	If you don't mind paint on the ball, I bet this would work:
> 	You need paint, a thin brush, and a trashbag or tarp, laid flat on
> the ground.
> 	Paint a thin line of paint on the tarp.  Roll the ball along it.
> The ball will have a circle painted on it.
> 	Now paint another line (or use the same one, if paint's still
> wet).  Roll the ball along the line again, but this time start it out so
> that the second circle is not painted right over the first.
> 	You will have 2 circles painted around the ball.  They would be
> called "Great Circles" on a globe, because they are the circumference of
> the ball at its widest diameter (eg, the Equator, all the longitude
> lines).  The 2 points where the circles cross will be 180 degrees from
> each other, regardless of the angle between the circles.
> 	If you use white paint, no one will notice once it dries.
> 
> 						--Doug 
> 
> 
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