Descriptions of these vertical post sundials, why they work, detailed account of the maths necessary to plot the hour lines.
http://plus.maths.org/issue11/features/sundials/
Describes different types of sundials, has other technical and general information. Offers free Shadows software to compute sundials of a number of different types for anywhere in ...
http://web.fc-net.fr/frb/sundials/defautgb.htm
Heiner Thiessen designs Sundials that can tell the time of Ssunrise and Sunset and tell the angle of Solar declination and even the time at night. This site shows how they work.
http://www.solardials.com
Describes sundial parts and names, the basic types, and has make your own pages for three simple types of dial.
http://home.netcom.com/~abraxas2/sun.htm
Describes the history of sundials, and their development in Europe from the time of the Greeks. Includes literary and poetic references.
http://www.hps.cam.ac.uk/starry/sundials.html
On-line catalogue, with facilities for search, adding records, map, statistics, articles and references.
http://au23.troja.mff.cuni.cz/~mira/sh/sh.php?lang=1
Information on the society, links, beginner's pages, including simple sundial patterns and templates, online facilities to calculate hour lines for different sundial types.
http://www.sundialsoc.org.uk/
Information is mostly in Dutch, but with some English language pages, including how to calculate several types of sundial.
http://home.iae.nl/users/ferdv/
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