(urth) Ansible Interview

[Jeff Wilson]

Matthew Groves wrote:
  > Imagine a roughly circular cross-section of the whorl, with the long
> sun as a point light source in the center.  Put a little stick-figure
> Silk down at 6:00.  Draw a cross-section of a bowl resting on with its
> bottom on the surface of the Whorl at, say, 1:00.  Sunlight shines
> into the valley at all times except shadelow.  Now, draw another bowl
> at 2:00, but tilt the bowl counterclockwise until the rim begins to
> eclipse the sun.  Now you've got shadow in your bowl.  If you draw an
> arrow indicating Silk's line of sight, you should find that he can see
> the shadow in the bowl.

I suppose that counts as "beyond the shade" in that the bowls are 
farther away than the shade is, though the direction is off about 30 
degrees.

-- 
Jeff Wilson - jwilson at io.com
< http://www.io.com/~jwilson >