Dear readers, two more informations to that subject: only in 1985 there were placed a polar gnomon on the dial from "1346" by the Braunschweiger Landeskirche. If the date of 1346 is correct nobody knows. See also my article that you may find on my web page www.antike-sonnenuhren.de/artikel.htm karlheinz
-----Ursprüngliche Mitteilung----- Von: Frans W. Maes <[EMAIL PROTECTED]> An: [EMAIL PROTECTED] <[EMAIL PROTECTED]> Cc: sundial <[EMAIL PROTECTED]> Verschickt: So., 24. Aug. 2008, 12:57 Thema: Re: equal and unequal hours Dear all, [EMAIL PROTECTED] wrote: It is true that the first mechanical clocks was on the towers around the begin of the 1300. And the first vertical sundials with the polar gnomon was done arond the first half of 1300. The interesting articles of Curt Roslund in the BSS Bulletin, september 2005, pag. 116-119, show the vertical sundial of Braunschweig Cathedral of 1346 with the equal hour lines and a polar gnomon. The 1346 dial now has a polar gnomon. As recent as 1964 there was no nomon, merely a large hole (Zinner). It is not known, how the original nomon was oriented. In my view, it is unlikely that it was a ole-style. The angles were laid out according to the 'Erfurt formula', s Zinner and Roslund point out. This rule does not say anything about he orientation of the gnomon. If it was intended to be pointing at the elestial pole, the formula would most probably have provided accurate nstructions for that. To answer R oger's question: The dates of the 1334 and 1346 dials were educed from the building history of the cathedral, assuming that they ere laid out at the time of completion of the particular buttresses. Regards, rans Maes -------------------------------------------------- ttps://lists.uni-koeln.de/mailman/listinfo/sundial ________________________________________________________________________ AOL eMail auf Ihrem Handy! Ab sofort können Sie auch unterwegs Ihre AOL email abrufen. Registrieren Sie sich jetzt kostenlos.
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