Hi John, Remember my talk at the NASS conference last year, "How Long is My Shadow" In this presentation I described the Excel spreadsheet that I wrote as a design tool for analematic sundials. For the defined location (latitude and longitude), it calculates and plots the hour points on the analemma ellipse and shows the path of the shadow tip for defined heights and solar declinations. This clearly demonstrates the problem with short summer shadows at your latitude and long winter shadows at mine.
My offer to provide the presentation slides and spreadsheet on request still stands. You will need Microsoft Office 97 including Powerpoint and Excel to use the files. If you do not have these programs but do have Delta Cad, then Fer De Vries posting is probably a better offer. The 35mm slides that I presented to show the test layout on my deck and the finished product as built at the Calgary Science Center are not available as I have not scanned them. I would also have to get model releases from my grandchildren! Roger Bailey Walking Shadow Designs N 51 W 115 At 07:29 AM 8/8/00 -0700, John Carmichael wrote: >Hello all: > >I have been asked to design an analemmatic interactitive sundial for a >university in southern California. The dial will use the shadow of the user >who will function as the gnomon. > >Does a sundial generator program exist for analemmatics? Although I think I >can do the math and drawings by hand, I'd feel more comfortable if the >computer did it as I've never done this before. (For example, I'd like to >see how long the major axis of the elipse should be based on the average >height of an adult person) > >Also, my client would like to see some photographs of existing analemmatic >dials. Would any of you happen to know where I can download some fotos? > >Thanks > >John Carmichael >Tucson Arizona > > > > > > >
