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Username yuandrew
Joined Aug 26, 2011
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09/27/17 at 08:55Form109

This area of Riverside County as well as much of San Diego County to the south are located within the "light pollution controlled" zone that once spanned a 45 mile radius from Palomar Observatory. Low pressure sodium lighting was mandated for this area in the late 80's to early 90's in order to avoid interfering with observatory operations as the monochromatic yellow light was less glaring and could be easily filtered out.