Hi John, You believe that you are right. The attached sketch (Shadow.jpg) shows this fairly clearly. At 21 kb it is too big to post on the mailing list unless there is a strong demand.
Roger Bailey At 06:45 AM 5/4/99 -0700, you wrote: >Hello all: > >I was just thinking that on a horizontal sundial that the true shadow point >would ONLY be at the center of the penumbra at high (apparent) noon. In the >late afternoon or early morning, the sun would be to the side of the style, >causing the shadow to strike the dial face at an angle. Wouldn't this shift >the true shadow point towards the center of the sundial, away from the >center of the penumbra? (wish I could make you a little drawing of this as >a picture is worth a thousand words). > >John Carmichael > >> > >
