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Bedoelde u: Clude beweert dat de zonnewijzer de productie is van een polaire zonnewijzer Luisteren Clude claims that the sundial is the projection of a polar sundial See on the website of Frans Maes, click on The principle of the analemmatic dial Op 23-apr-2011, om 21:24 heeft Claude Hartman het volgende geschreven: > I would like to question the instructional qualities of analemmatic sundials. > > Unlike Tony Moss' 'Multi-dial', it is my view that there is only one > relationship easily illustrated - the projection of a polar dial on to a > horizontal surface is an ellipse with corresponding hour points. It is > extremely difficult why (or how) a vertical person or staff casts a shadow to > these points. > > I am afraid that the instruction falls into rote learning of procedure like > so many sundial kits (and much of pedagogy). I do not know what the > underlying motivation was for "that part of the UK National Curriculum". I > assume it was to understand something of the natural world and not to acquire > the skill of making a sundial. Under that assumption I think the analemmatic > falls short and could produce confusion for inquiring minds. > > With that said I certainly would NOT join any ban on such dials as "dangerous > for children"! Indeed, both children and adults interact with them quite > well and they can make a beautiful asset in a school. However, expect > difficulty with a persistent inquiring person seeking explanations. > > Perhaps someone on this list can show me a way to explain that to anyone > lacking much geometric skill such as a 10 year old (or me). > > Claude Hartman > (retired science teacher basking in the sunshine of 35 N, 120 W) > > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial >
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