Again my reply to Favio didn’t post. I don’t know why, but now I’m trying again to post it:
, Favio— . You wrote: . [quote] The idea of reviving the Rep. Calendar (together with the corresponding Greg. Calendar) is that of an intellectual fun [/quote] . Undenniably so. . [quote] 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. [/quote] . Yes, the Solar Haji calendar of Persia is accurate too. . I don’t know whether the Indian National Calendar or the Solar Haji is more accurate. . The Solar Haji uses a pure astronomical yearstart, & that makes it a fraction of a day more accurate. . Also, it includes a 29-day month. If the Indian National Calendar changes the 29 day month to 30 days, to keep all the months to 30 or 31 days (maybe for the convenience of monthly-payments), that would amount to some loss of accuracy. . But it seems to me that they said that the Solar Haji’s 29-day month is the last month of their year, which would be the ecliptic month of Pisces. But the shortest month of the year should be the one that includes our orbital perihelion….& isn’t that in Sagittarius or Capricorn. . Anyway, those two calendars are the most accurate day-count calendars. (as opposed to ecliptic-month systems that start the year at the exact moment of a solstice or equinox). . [quote] 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… [/quote . Maybe not explicitly, but of course they were intentionally measuring the same ecliptic-months that the traditional Aries-Pisces ecliptic-months measure. …but the FRC of course does so with a day-count calendar, so the months aren’t exactly the same. . [quote] 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. [/quote] . But, we have the hour-lines to tell the hours. . Do you mean have a declination-line for each hour? But that would unacceptably clutter the dial, because there are so many hours in a half-year. …& look at how little hour-accuracy there’d be, with those very closely-spaced hourly declination-lines. That doesn’t sound feasible for sundial timekeeping. . [quote] 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). [/quote] . I tried to find those dials at the Sundial-Atlas, but I couldn’t find a search-provision there. . [quote] On the Rep. Cal. 230, today is the day of 'celebration of convictions' :-) [/quote] . An appropriate day-name for this day when calendrical preferences are being discussed. . Wishing you a good year. . Wishing you good new ecliptic-month of Scorpio, the month before Sagittarius, the run-up to the Solstice upturn. . Wishing you a good Celtic New-Year, at Samhain . Ecliptic-Month Virgo, degree 28 . Michael 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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