Determining how much time error, at a certain time, a given azimuth-alignment-error will cause, or what azimuth-alignment error would cause a certain time error at a certain time--That isn't an unusual kind of problem.
But, if you want to use clock-time to set a sundial, then just rotate the dial till it says the correct Local-True-Solar-Time. Of course you find the correct Local-True-Solar-Time from the clock-time, by means of EqT and longitude. In earlier times, that would often be done by using a noon-line to determine Local-True-Solar-Noon. The noon-line drawn north-south to the base of a vertical, which could be a window-edge or a vertical edge of a square-cross-section pole. Determining north without a clock or watch can be done by marking the position of the shadow of some point like the tip of a twig, or a corner at the top of a square post. Mark the position of the tip-shadow in the morning, measure from it to the point directly under the shadow-casting point (which could be determined by a plulmbline). In the afternoon, when the distance from tip-shadow to the sub-tip point is the same as before, mark the position of the tip-shadow again. The line between the marks is east-west, and a line perpendicular to it is north-south. That's a way to determine north-south for making a noon-line, by which to align a sundial at Local-True-Solar-Noon. Alternatively, one could just wait till it's getting close to noon, and then start marking the tip-position, and note when it's at its shortest, at which time it's to the north of the sub-tip point. Michael Ossipoff On Sat, Aug 8, 2020 at 12:59 PM André Reekmqns <andre.reekm...@skynet.be> wrote: > Looking for the 3 pages article published in BSS or NASS 10 years? about > rectifying a misaligned pole-style horizontal or vertical sundial. > > > > André Reekmans > > Sundial Society of Flanders, Belgium. > > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > >
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