May I recommend Gianni Ferrari's splendid article:
http://www.ta-dip.de/fileadmin/user_upload/bilder3/6c07ca7481c84092971f6984b17cae60_Ferrari_Kopernikus.pdf
You can find it in the end of my Kopernicus- link
http://www.ta-dip.de/salon-der-astronomen/bewohner-des-salons-der-astronomen/copernicus-nicolaus.html
And just to remember an excellent tool > Tridux 2000 by Dietrich Ahlers to construct a Reflex-dial:
http://www.ta-dip.de/sonnenuhren/meine-sonnenuhren/r1-reflex-sonnenuhr.html
and
http://www.ta-dip.de/sonnenuhren/meine-sonnenuhren/r2-reflex-sonnenuhr.html
Reinhold Kriegler
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Reinhold R. Kriegler
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