Dear Dialists, I think the ‚classical‘ analemmatic dial on (school) playgrounds etc. can show many interesting astronomical (calendrical) aspects – even more than pure time reading by an active person. This can be done if sundial markers are included, which were suggested the first time by Roger Bailey. With these 2 fix marked points one can demonstrate easily the changing positions of sun rise/set during the year at the location of the dial and the changing times of sun rise/set (and day lengths) in the course of the year (See The Compendium - Volume 10 Number, September 2003, page 8-14) or http://helson.at/sonre/Alemm_NASS_Sonderegger.pdf )
Helmut Sonderegger Von: Kevin Karney <[email protected]> Gesendet: Monday, April 5, 2021 10:26 AM An: [email protected] Cc: Maes, F.W. <[email protected]>; Jack Aubert <[email protected]>; Sundial Mailing List <[email protected]> Betreff: Re: Is this an educational sundial, or a 'NON-dial'? I am not a particular fan of analemmatic dials, but ...... for children of the right age and ability who are taught by an inspirational teacher, the delineation and decoration of an analemmatic dial in the school playground has great merit in the amalgamation of history, art, astronomy, trigonometry, geometry and practical measurement. Kevin Karney, Freedom Cottage, Llandogo, Monmouth NP25 4TP, Wales Phone 01594 530 595 or 07595 024 960 On 5 Apr 2021, at 09:09, Siegfried Netzband <[email protected]> wrote: Hi alll, agree in general to everything that has been said about the analemmtic sundial. To me the interactivity is the main advantge of the dial. Especially today. It attracts people to work with it and not just to look at it or even just notice it (or not, because they do not know what a dial is or do not understand "what is going on there"). One thing I miss in the discussion: The bearing stones. To me they make the dial quite interesting - but they very seldom appear in reality and in discussions. By them the dial becomes, without sunshine, a year round sun calender. In literature about the analemmatic dial they are missing quite often. Why is the fact "without sunshine" so seldom taken up and why do so very few dials have these stones? Any idea? Regards Siegfried Siegfried Netzband Hebelstr. 12 75233 Tiefenbronn Tel: 07234 2802 Fax: 07234 942909 Mob: 0151 53083636 / 0160 1531634 E-Mail: [email protected] E-Post: [email protected] Skype: siegfried75233 www.ferienhaus-frieseneck.de <http://www.ferienhaus-frieseneck.de> -----Original-Nachricht----- Betreff: Re: Is this an educational sundial, or a 'NON-dial'? Datum: 2021-04-05T09:37:28+0200 Von: "Maes, F.W." <[email protected]> An: "Jack Aubert" <[email protected]> Hi all, One property of the analemmatic dial I like to stress: when it has the right size, you can act as gnomon yourself. This makes it an interactive instrument, which is appealing: you have to DO something to get the time. And with the good frame of mind it makes you feel part of the celestial gearworks, which may even be more satisfying. Best regards, Frans Maes <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> Virusvrij. <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> www.avg.com On Sat, Apr 3, 2021 at 10:28 PM Jack Aubert <[email protected] <mailto:[email protected]> > wrote: 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 <[email protected] <mailto:[email protected]> > On Behalf Of R. Hooijenga Sent: Saturday, April 3, 2021 3:47 PM To: [email protected] <mailto:[email protected]> 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 <[email protected] <mailto:[email protected]> > Namens Linda Reid Verzonden: zaterdag 3 april 2021 20:04 Aan: [email protected] <mailto:[email protected]> 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 --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
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