Equations for Sundial
Written by Toshimi Taki
March 8, 2008
Equations necessary to make planar sundials are derived. You can choose any orientation for the
plane of a sundial.
Click here to download "Equations for Planar Sundials" (326KB) in pdf file.
Download MS-Excel File
Click here to download "sundial_eng_071028.xls" (1,062KB)
Example of Calculation -- Vertical Sundial for Latitude = 35-degree
Example of Calculation -- Horizontal Sundial for Latitude = 35-degree
Example of Calculation -- Vertical Sundial of Trinita dei Monti (Latitude: 41.9-degree)