Dear Dialers, While we are on the subject of rotating dials around their gnomons or other lines parallel to the earth's axis ( Or not so very far off of the subject ) Other things can be accomplished by the rotation as well as EOT, Longitude and Daylight savings compensations. For instance a Horizontal dial can be rotated a number of full hours, the hourlines renumbered and made viewable from a window or other site. Instead of starting at say 6 AM, the dial might start at 9 AM for more civilized folks. Some dials, such as the Cycloid Polar Sundial and the book dial derived from it typically have the Noon line buried down in a deep cleft. Rotating them a few hours can put noon where it is easily read. In fact other copies of the sundial, prerotated, can be placed above or below so that all of the hours are easily read. Of course rotating several hours can be done to show the time in other time zones as well. An horizontal dial rotated a few hours and renumbered lets the rain and leaves run off better.
What other uses do polar axis rotated dials have? Enjoy the Light! Edley McKnight
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