sundials:

design your own analemmatic dial at
http://www.jgiesen.de/hsd/hsd300.html

design yu0r own horizontal sundial at
http://www.jgiesen.de/Divers/PieSundial/pie200.html
http://www.jgiesen.de/Divers/PieSundial/pie300.html

design your own horizontal sundial at:
http://axum.tripod.com/newAR_dial.html

time at which sun is true geographic north (or south) of your location
http://www.solar-noon.com/