On Tue, Sep 20, 2022 at 9:08 AM fabio.sav...@nonvedolora.it < fabio.sav...@nonvedolora.it> wrote:
> Dear Michael > > The idea of reviving the Rep. Calendar (together with the corresponding > Greg. Calendar) is that of an intellectual fun and I would be amazed to > discover other implications. > > There are many calendars still in use in the world even if to give us an > appointment it has become common to refer to the Gregorian Calendar. > If you really wanted a calendar to be hooked with precision to the > declination curves, I believe that the most authoritative is the Persian > Calendar, still in use in Iran and Afghanistan, which uses the names of > the zodiac for its months, that is, equating what gnomonists usually do. > > I don't think that the creators of the Rep. Calendar had the intention > of reinterpreting the names of the zodiacal months (30° of longitude) > with those of their calendar even if, despite a bit of approximation, > these name could be a curious and entertaining option for people fasting > in astronomy but able to perceive the meaning of these names. > With all the limitations of this option by varying the latitude. > > If I really had to make some considerations on declination curves, I > must say that lately I have rediscovered the use of these curves to > define diurnal arcs of whole hours, i.e. selecting the declination > values corresponding to diurnal arcs of whole hours and indicating this > duration on the curves. > There are not many sundials with these features but they exist and > provide useful and not commonly available information (Sundial Atlas > DE2758, CZ218, AT1291, IT14055, FR4881). > On the Rep. Cal. 230, today is the day of 'celebration of convictions' :-) > > ciao Fabio > > -- > Fabio Savian > fabio.sav...@nonvedolora.it > www.nonvedolora.eu > Paderno Dugnano, Milano, Italy > 45° 34' 9'' N, 9° 9' 54'' E, UTC +1 (DST +2) > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > >
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