Useful reference articles about sundial topics
Unless otherwise stated, these articles are by N. Ta'Bois and appeared originally in "Clocks" magazine..
Adjusting for Longitude
The Analemma
Calculating hour lines
Disc dials
Equinoctial dials
Gnomon or style
Greenwich meridian
Hours and hours
Latitude & sundials
Meantime dials
Minor adjustments
The Noon Mark
Pillar dials
Ring dials
Significant dials
"Sun time & clock time"