We might suggest that if you have any doubts whatsoever about the correctness of a sundial pattern or its installation, you can easily test it to see how well it keeps the time and date if you tape a paper drawing of it and its cardboard gnomon to an existing window or a board located where the sundial window will be. When testing its time telling and date reading performance, don't forget to correct your time readings for Daylight Savings Time, Longitude Shift, and The Equation of Time if necessary. (Your sundial designer should tell you about these things and can provide you with a test paper drawing and a cardboard gnomon.)
 |
|
|