The Pole-to-Dial Converter-Calculator
Use the "Pole-to-Dial Converter-Calculator" to convert any vertical pole (e.g., a flagpole, utility pole, etc.) into a fully functional reduced horizontal sundial featuring declination lines ("date curves") for the equinoxes and solstices.
Enter your latitude and gnomon height (pole height) below, then click on the "Calculate!" button. The Pole-to-Dial Converter-Calculator will calculate all of the hour angles and distances that you need to construct the date curves on your sundial.
To find your latitude and longitude, consult a good map or visit:
Entire world: http://www.getty.edu/research/conducting_research/vocabularies/tgn/
Entire world except USA: http://www.calle.com/world/index.html
USA Only: http://www.census.gov/cgi-bin/gazetteer
CAUTION: This table will not work well for latitudes smaller than 4 degrees.