Weather Blog

WEATHER BLOG

August 22, 2008|By FRANK ROYLANCE

Charles Grene in Westminster asks: "In the Central and Mountain time zones, with all their mountains, hills, forests and deserts, how are the sunset and sunrise times arrived at?" Same as for urban canyons: math. Local conditions vary so widely that published tables for any location must assume ideal conditions: a clear, flat horizon at the same altitude as the observer. Rise and set times are pegged to the moment when the top of the sun's disk would first appear and the last bit would disappear.

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