The author’s web site seems to be an attempt to monetize has plans for analemmatic dials claiming that the whole thing is educational. There is even a link for franchised distributors! I suppose it would be interesting to see what kind of information is contained in the book. The drawing on the cover is, like a stopped watch, occasionally correct – but only once a day and only if you decide what part of the shadow to use. It looks like a scam.
My personal view of analemmatic dials is that they can be decorative and even entertaining, but are not very educational at all. It is hard enough for me visualize the projection of a conic section onto a horizontal plane and relate it to the sky and the sun let alone explain it to a kid. It’s somewhere between magic and a trick pool shot. Jack Aubert From: sundial <sundial-boun...@uni-koeln.de> On Behalf Of R. Hooijenga Sent: Saturday, April 3, 2021 3:47 PM To: sundial@uni-koeln.de Subject: RE: Is this an educational sundial, or a 'NON-dial'? For this kind of instrument, I personally like to use the term 'Undial'. So far, it didn't catch on, however - pity! 😊 Good Easter, Rudolf Hooijenga 52 30 N 4 40 E -----Oorspronkelijk bericht----- Van: sundial <sundial-boun...@uni-koeln.de <mailto:sundial-boun...@uni-koeln.de> > Namens Linda Reid Verzonden: zaterdag 3 april 2021 20:04 Aan: sundial@uni-koeln.de <mailto:sundial@uni-koeln.de> Onderwerp: Is this an educational sundial, or a 'NON-dial'? [...] but looking at the illustration on the front cover, it seems to be a 'NON-dial'!
--------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
