Sundials - World's Oldest Clocks

North American Sundial Society

ZW2000 Sundial Design Software
http://www.sundials.org/images/NASS_Software/zw2000version2.zip
Fer J. de Vries has created the most useful sundial construction software called de Zonnewijzerkring, or simply ZW2000. It is written for both 32 and 64 bit (Windows based) computers, and is intended to give accurate and exportable drawings (DXF and PLT format) of all the lines and curves you will need to make your sundial. The exported drawings can be polished in other programs such as Delta CAD. Fer J. de Vries site is unavailable, but the software is made available through NASS as a zip file using the above link.