> > Any non-declining dial...i.e. any dial whose style is in the > meridional-plane, can be easily & briefly explained as a Horizontal Dial at > a different latitude.
Sorry, I meant to say "...any dial for which the normal to the dial's flat shadow-receiving plane is in the meridional-plane..." On Sun, Apr 4, 2021 at 6:53 PM Michael Ossipoff <email9648...@gmail.com> wrote: > I agree about Analemmataic Dials not being educational, except for > students who are interested in the trig and willing to listen to, study and > work on the subject. Some are, and for them it would be great. > > But for most people, it's just a magic-trick, as you pointed out. The > Analemmatic has the advantage of being vandalism-proof, but it seems to me > that there's no satisfaction, fun or interest for someone in a dial unless > they want to hear the explanation for why it works...and few would be > willing to listen to the construction-explanation of the Analemmatic. > > The Horizontal-Dial has a brief, clear and simple explanation, deriving > from lines drawn on the horizontal surface to where a Polar Dial intersects > that surface. ...and the Polar Dial of course derive from an Equalorial's > hour marks projected from the disk or cylinder onto a polar-parallel plane. > > Any non-declining dial...i.e. any dial whose style is in the > meridional-plane, can be easily & briefly explained as a Horizontal Dial at > a different latitude. > > On Sat, Apr 3, 2021 at 11:34 PM Peter Mayer <a1000...@adelaide.edu.au> > wrote: > >> Hi Rudolph, >> >> I DO like 'Undial'! Thanks for reminding us of your inspired name. >> >> best wishes, >> >> Peter >> On 4/04/2021 5:16:57, R. Hooijenga wrote: >> >> 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> Namens Linda Reid >> >> Verzonden: zaterdag 3 april 2021 20:04 >> >> Aan: 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 >> >> -- >> ----------- >> Peter Mayer >> Department of Politics & International Relations (POLIR) >> School of Social Scienceshttp://www.arts.adelaide.edu.au/polis/ >> The University of Adelaide, AUSTRALIA 5005 >> Ph : +61 8 8313 5609 >> Fax : +61 8 8313 3443 >> e-mail: peter.ma...@adelaide.edu.au >> CRICOS Provider Number 00123M >> ----------------------------------------------------------- >> >> This email message is intended only for the addressee(s) >> and contains information that may be confidential >> and/or copyright. If you are not the intended recipient >> please notify the sender by reply email >> and immediately delete this email. >> Use, disclosure or reproduction of this email by anyone >> other than the intended recipient(s) is strictly prohibited. >> No representation is made that this email or any attachment >> are free of viruses. Virus scanning is recommended and is the >> responsibility of the recipient. >> --https://www.adelaide.edu.au/study/ >> >> --------------------------------------------------- >> https://lists.uni-koeln.de/mailman/listinfo/sundial >> >>
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