Physicists and philosophers always struggled with a definition of time. To measure something, however, you must first know what it is. They turned the order around and defined time as the phenomenon that you measure with sundials and later clocks. In order to measure time or duration, the natural course of an event was previously invoked, the repetitive occurrence of which showed a similar or similar pattern: the movement of the stars or of the sun. Such a rhythmic course served as a unitary measure for the division of time and thus of the sundial. It always involves a regularly recurring event with the help of which the duration of other moments or periods is measured.
The period that was measured was either from sunrise to sunset, divided into 12 equal parts, or that from noon to noon, divided into 24 equal parts. Each division was called an hour. In the first case the hours differed from day to day in duration. Hours in the summer were longer than those in the winter. To this end, the Sundial screen was divided into sectors. The time that the shadow of a gnomon took to glide across one sector had to be an hour. To have equal hours during one day, the sectors were different from width. Later the maths were found behind this construction. Armenian sundials and also scratch sundials or sundials for canonic hours do not fulfill that condition and you can hardly call them a time-measuring instrument. At the most they divide the time. The sectors in which they are divided are equal, but the hours they indicate are different, even in one day. That is why I said in my previous message that Armenian sundials are more a building ornament than an instrument to measure the time. The explication of the 12 apostles for the 12 hours on Armenian so-called sundials does not hold. Sometimes there are 12 divisions and sometimes 10. Excuse for my clumsy English. Willy Leenders Flanders in Belgium > Op 4 mrt. 2019, om 14:04 heeft Mario Arnaldi via sundial > <[email protected]> het volgende geschreven: > > Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die > eigentliche Nachricht steht dadurch in einem Anhang. > > This message was wrapped to be DMARC compliant. The actual message > text is therefore in an attachment. > Van: "Mario Arnaldi" <[email protected]> > Onderwerp: Antw.: Article about Armenian sundials > Datum: 4 maart 2019 om 14:04:20 CET > Aan: "lista internazionale" <[email protected]> > > > Actually some buoldings shown in the article are not medieval, se the dials > or pseudo-dials on it are there only for cultural ornament. Different > thinking we have to put on the medieval ones. As Frank just wrote that is a > commom graphics to draw medieval sundials with temporal hours. Theay are > gnomonically uncorrect, I know, but they were intended as sundials > (horologium) for at list 1000 year by all people living in Europe and > Christian Middle East. That kind of pattern came fron antiquity: Egiptians > made portable sundials so divided in a semycircle and Romans too (but fixed), > and they were not decorative, they were made for reckoning time. > > Mario > Ravenna (Italy) > > From: Willy Leenders <mailto:[email protected]> > Sent: Saturday, March 02, 2019 4:16 PM > To: [email protected] <mailto:[email protected]> > Cc: Sundial sundiallist <mailto:[email protected]> > Subject: Re: Article about Armenian sundials > > The Armenian sundials are more a building ornament than an instrument to > measure the time. > The sundial scene is divided into 20 or 24 parts at equal angles (ie of 18 or > 15 degrees). > The shadow of a gnomon will indicate different time periods depending on the > date. > > Willy Leenders > Hasselt in Flanders (Belgium) > > Visit my website about the sundials in the province of Limburg (Flanders) > with a section 'worth knowing about sundials' (mostly in Dutch): > http://www.wijzerweb.be <http://www.wijzerweb.be/> > > >> Op 2 mrt. 2019, om 01:25 heeft [email protected] >> <mailto:[email protected]> het volgende geschreven: >> >> This was sent to me by a friend. >> >> https://www.panorama.am/en/news/2019/02/23/Armenian-sundials/2076856 >> <https://www.panorama.am/en/news/2019/02/23/Armenian-sundials/2076856> >> >> >> >> --------------------------------------------------- >> https://lists.uni-koeln.de/mailman/listinfo/sundial >> <https://lists.uni-koeln.de/mailman/listinfo/sundial> >> > > > > > > > > > > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > > > > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> > Mail priva di virus. www.avast.com > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> > <x-msg://4/#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial >
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