So this could be called "analemmatic shadow plane sundial" perhaps? (Note the date scale must be reversed as well.)
-- Jan On Thu, Jun 26, 2008 at 10:37 AM, <[EMAIL PROTECTED]> wrote: > Sorry, folks. As always, Chris Lusby Taylor is right. And as usual I have > egg on my face. I guess it's a privilege to be mentored by such a precise > and patient authority. > > Back to the drawing board. Here's my next proposal: > > Lay out a conventional analemmatic sundial turned through 180 degrees, i.e. > with the noon marker to the south of the calendar line. Surround the sundial > with a circular path, separated from the sundial by a circle of railings. At > the appropriate point on the calendar line place a short upright pole which > could be square in cross-section. > > Tell the visitor to walk around the circular path until his/her shadow falls > in the direction of the pole. Read the time from the analemmatic hour mark > on which the visitor's shadow (not the shadow of the pole) falls. > Cover the bottom few inches of the pole with the retro-reflective material > sold by 3M for road traffic signs. Then, with luck, when the visitor stands > on the right spot and views the pole from the same azimuth as the sun, the > foot of the pole will appear to glow. > > This meets several of Mr Phillips' desiderata. The principal hour markers > will be on the southern side of the dial. He will get his circle or > semi-circle. The dial will use a human gnomon. The pole must be moved each > week along a north/south scale, but the scale itself could be fairly > inconspicuous. Since visitors are not allowed to tread on the sundial face > it can be planted tastefully - maybe in rows parallel to the driveway? > > Now shoot that one down! > > John Lynes --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
