Re: Is this an educational sundial, or a 'NON-dial'?
> > 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 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 > 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 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 >> >> --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Is this an educational sundial, or a 'NON-dial'?
On Sun, Apr 4, 2021 at 6:57 PM Michael Ossipoff wrote: > ...and the Horizontal-Dial, if not in shade, tells time whenever the Sun > is up, and is readable from every direction, if the person is sufficiently > close to it....and, in general, the Flat-Dials are the easiest-built > dials. > ...and , with suitable orientation, can excel in distance-readability > > On Sat, Apr 3, 2021 at 11:34 PM Peter Mayer > 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 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 >> >> --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Is this an educational sundial, or a 'NON-dial'?
...and the Horizontal-Dial, if not in shade, tells time whenever the Sun is up, and is readable from every direction, if the person is sufficiently close to it....and, in general, the Flat-Dials are the easiest-built dials. On Sat, Apr 3, 2021 at 11:34 PM Peter Mayer 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 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 > > --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Is this an educational sundial, or a 'NON-dial'?
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 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 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 > > --- https://lists.uni-koeln.de/mailman/listinfo/sundial
