Hello,
there are a lot of links at http://www.ph-cip.uni-koeln.de/~roth/slinks.html Did you check that? On this page I concentrate mainly on sundials and do not include related sciences (like astrolabes and so on). If one has contributions, please e-mail me. As well as pointing out dead links. Regards - - Daniel N.B. Thanks to Steven Woodbury for the many links he sent to me!
