(urth) Ansible Interview

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-----Original Message-----
From: "Son of Witz" <sonofwitz at butcherbaker.org>

Date: Wed, 21 Jan 2009 22:31:59 
To: The Urth Mailing List<urth at lists.urth.net>
Subject: Re: (urth) Ansible Interview


well.......

the sun turns. It may be a cylinder or a plane, but the point is that half of it is shaded.
meaning, it's photon vectors are not omnidirectional.
At some points the sun is a sliver. it widens & narrows through the day.
and there IS a shade, that's why sunset is called Shadelow, I don't remember pulses of darkness and I just finished that book.
So as this light plane, or half cylinder rotates, it would have shadows.

And then there is ambient reflected light, and we're talking about Shadows in the skylands, where, conceivably, there would only be reflected light off of neighboring lands that aren't yet in darkness. Then the fact that the Shade is not opaque, since you can see the skylands in the first place, so there would be additional reflected light.  I think all of that adds up to enough an uneven distribution of light, and thus shadows.

/my two cents.
~witz

>-----Original Message-----
>From: David Stockhoff [mailto:dstockhoff at verizon.net]
>Sent: Wednesday, January 21, 2009 01:50 PM
>To: urth at lists.urth.net
>Subject: (urth) Ansible Interview
>
>I have been browsing the Ansible interview, and I notice what seems to 
>be a simple, incontrovertible error on Wolfe's part:
>
>8. /How is Silk able to see these valleys filled with shadows [in the 
>skylands at night, at the opening of chapter 4, book 1] if the Whorl is 
>a cylinder with the long sun running approximately down the centre?/ -- 
>This one throws me completely. Where is the difficulty, unless all the 
>valleys run parallel to the Long Sun? Naturally they don't. [DRL: I see 
>a Wolfean trap here. The groundlings' references to the 'shade' of night 
>strongly suggest a literal revolving shade around the sun. But there are 
>later indications that night involves some sort of dark stuff sent in 
>pulses along the axis to mask a certain length of the Long Sun.]
>
>Thing is, the Whorl is the interior surface of a cylinder. Therefore, 
>"up" is always toward the center.
>
>Since the LS runs along the center from end to end, you can treat the 
>issue of shadows with only 2 dimensions. It won't matter whether the 
>valleys run along the Sun or the other way. Only if they are tilted or 
>overhanging will they cast shadows.
>
>Anyway, as Langford notes, there is a shade of some kind always blocking 
>one side of the Sun.
>
>So we should not assume Wolfe to be perfect in his physics. ;)
>
>
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