El mié., 26 feb. 2020 a las 12:00, <sundial-requ...@uni-koeln.de> escribió:
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(Michael Ossipoff) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Tue, 25 Feb 2020 20:59:26 +0200 > From: Dan-George Uza <cerculdest...@gmail.com> > To: Sundial List <sundial@uni-koeln.de> > Subject: Sunrise time glitch? > Message-ID: > < > cacouaypu00tmdnadnxudgbzqqzwzyyrf3zti-iyuxwvvkxj...@mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > Hello all, > > While doing some research for a paper, a friend of mine noticed peculiar > differences regarding sunrise times for his city (Alba Iulia, Romania). > They occur both on TimeAndDate.com as well as suncalc.org and -so far I > can > tell- only in Romanian cities (Berlin and Vienna are okay). > > I figure sunrise times should be pretty much the same except for the leap > year cycle, but for example between December 1st 1930 and December 1st 1931 > the times differ by more than 15 minutes. What could be the cause? > > I also looked at Gian Casalegno's Sun Ephemeris and all the times check out > neatly there. > > -- > Dan-George Uza > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > https://lists.uni-koeln.de/mailman/private/sundial/attachments/20200225/4c7c057f/attachment-0001.html > > > > ------------------------------ > > Message: 2 > Date: Tue, 25 Feb 2020 18:45:06 -0500 > From: Michael Ossipoff <email9648...@gmail.com> > To: Dan-George Uza <cerculdest...@gmail.com>, sundial list > <sundial@uni-koeln.de> > Subject: Re: Sunrise time glitch? > Message-ID: > < > caokdy5amq603na-e_o3jdg7ytw4rzzd9sn79c9wlm03dxre...@mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > Dan-- > > Evidently those two sources you named got their result from the same other > source, which had made an error. ...or else one of those two sources got > their result from the other. > > If the two years are separated by a leapyear (but 1930 and 1931 aren't), > then there could be a 3-day difference in the correspondence between date > and ecliptic-longitude. > > But, since there was no leapyear between those two dates, there was just > the 1/4 day displacement that occurs at the end of a common-year. That > wouldn't be nearly enough to cause that difference in sunrise or sunset > times. ...or a sufficient difference in the EqT. > > So, evidently someone's error got copied and thereby propagated. > > 10 Tu > Pisces 7th > Februarius 25th > > On Tue, Feb 25, 2020 at 2:00 PM Dan-George Uza <cerculdest...@gmail.com> > wrote: > > > Hello all, > > > > While doing some research for a paper, a friend of mine noticed peculiar > > differences regarding sunrise times for his city (Alba Iulia, Romania). > > They occur both on TimeAndDate.com as well as suncalc.org and -so far I > > can tell- only in Romanian cities (Berlin and Vienna are okay). > > > > I figure sunrise times should be pretty much the same except for the leap > > year cycle, but for example between December 1st 1930 and December 1st > 1931 > > the times differ by more than 15 minutes. What could be the cause? > > > > I also looked at Gian Casalegno's Sun Ephemeris and all the times check > > out neatly there. > > > > -- > > Dan-George Uza > > --------------------------------------------------- > > https://lists.uni-koeln.de/mailman/listinfo/sundial > > > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > https://lists.uni-koeln.de/mailman/private/sundial/attachments/20200225/c608ab8d/attachment-0001.html > > > > ------------------------------ > > Message: 3 > Date: Tue, 25 Feb 2020 18:45:46 -0500 > From: Michael Ossipoff <email9648...@gmail.com> > To: Dan-George Uza <cerculdest...@gmail.com> > Cc: Sundial List <sundial@uni-koeln.de> > Subject: Re: Sunrise time glitch? > Message-ID: > <CAOKDY5CBjwB_Hh8mGTr-07NUOtz5Y4wbOz2= > ljmmawuoand...@mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > Now the Solar declination is more than halfway from its Yul > (Winter-Solstice) value to its Ostara (Spring-Equinox) value. > > And, in mid-latitudes (mid-lat U.S., and similar latitudes in Europe), the > daily insolation (ground-warming sunlight received by the ground) has > likewise passed the halfway point between its Yul and Ostara values. > > And, tomorrow, the daily insolation at that latitude will be half of its > annual maximum. That is, it will have a value that's half of its value at > Litha (Summer-Solstice). > > Tonight, Leo is the early-evening-rising ecliptic-constellation. Its > early-evening-rising now, just before the beginning of the Roman month of > Martius, heralds the evening-rising of Virgo just before the beginning of > the Roman month of Aprilis. > > Of course, during Aprilis, Virgo will be rising in the early evening sky > > On Tue, Feb 25, 2020 at 2:00 PM Dan-George Uza <cerculdest...@gmail.com> > wrote: > > > Hello all, > > > > While doing some research for a paper, a friend of mine noticed peculiar > > differences regarding sunrise times for his city (Alba Iulia, Romania). > > They occur both on TimeAndDate.com as well as suncalc.org and -so far I > > can tell- only in Romanian cities (Berlin and Vienna are okay). > > > > I figure sunrise times should be pretty much the same except for the leap > > year cycle, but for example between December 1st 1930 and December 1st > 1931 > > the times differ by more than 15 minutes. What could be the cause? > > > > I also looked at Gian Casalegno's Sun Ephemeris and all the times check > > out neatly there. > > > > -- > > Dan-George Uza > > --------------------------------------------------- > > https://lists.uni-koeln.de/mailman/listinfo/sundial > > > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > https://lists.uni-koeln.de/mailman/private/sundial/attachments/20200225/3dceb4cc/attachment-0001.html > > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > sundial mailing list > sundial@uni-koeln.de > https://lists.uni-koeln.de/mailman/listinfo/sundial > > > ------------------------------ > > End of sundial Digest, Vol 170, Issue 11 > **************************************** > Hello Dan, I have done the test with Solar Info and I get differences of seconds between the sunrises times in the two years. César Busto -- César Busto
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