I want to recommend Chris Lusby Taylor's article in the March BSS Bulletin on Italian/Babylonian hours and how they relate to the horizontal sundial. I had never really been interested in these hours much before, and did not understand the geometric principles involved. Chris's article took a little work for me to understand, but it was worth it, as the illustrations and text were right-on. I now understand how cone gnomons can naturally display these hours.
Best of all, he describes a method for easily telling hours from sunrise, or hours to sunset, from a horizontal sundial, using just a (destroyed) round Music CD. Very clever. Chris, did you discover this method yourself, or is a modern day adaptation of a previously known method? Bill Gottesman Burlington
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