Hello! I'm trying to build a reflecting sundial in my library room - or at least a reflecting noon mark. The room is about 3 meters wide on the window side and about 4 meters long. The window faces almost perfectly south and I am looking for tips as to how to attach the mirror to the window and what would be the optimal mirror size and shape. Would it be better to attach it on the inside or on the outside? Also, doesn't light refraction through glass mess things up? Since I'd like the sundial to show as many hour lines as possible, I figured the mirror needs to be only about one meter lower than the ceiling. I was thinking about gluing the mirror on the end of a car phone holder attached to the window glass. Please be so kind as to share some insights into these issues.
As far as the math is concerned, Simon Wheaton-Smith's spreadsheets are proving really useful to me. Thanks again! Dan Uza Romania
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