I'm not a programmer, but would assume that the weather sync would be a resource hog.
It would definately kill your battery fairly quickly, as it would constantly be on.
However, I would really like the other idea of yours.
Maybe at sunset show the sun on the horizon in the East (right side of the screen), noon it would be up high in the sky and set on the left side.
HELL OF AN IDEA!!!
Nexus One - retired
Proudly rocking the LG G2X 2011/04/20
LG G2X rooted 2011/04/21
As of Mar. 08, 2012 - G2X is now for sale
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I finally upgraded from CM7 to CM9 on my NookColor 2012/01/19