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http://www.seds.org/billa/psc/rays.html
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http://www.lunar-occultations.com/rlo/rays/rays.htm
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http://www.stargraham.com/fov.html
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http://www.astronomyphotos.com/PhotoshopTechniques1.htm
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http://www.licha.de/AstroWeb/articles_fullsize.php3?iHowTo=9
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http://www.cleardarksky.com/c/Fremont_CAkey.html
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http://www.cleardarksky.com/c/ChbtSPCCAkey.html
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http://www.cleardarksky.com/c/SonomaCAkey.html
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http://www.cleardarksky.com/c/HenryCoe_CAkey.html
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http://www.weasner.com/etx/buyer-newuser-tips/starcharts.html
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