The perpetual calendar
in [Math]
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From: António Marques on 19 Feb 2010 10:22 Zhang Dawei wrote (19-02-2010 15:08): > António Marques wrote: > >> Last time I looked, Symmetry454 was the epitome of calendar reform: >> >> http://individual.utoronto.ca/kalendis/symmetry.htm > > I wonder whether this is supposed to be a proposal for a universal > change in the calendar, though? If it is, then I question the need for > every country in the world to celebrate purely USA political and > social events (the yellow shaded days), which were said to be > "permanently fixed". On that basis alone, I would say it resoundingly > fails. How can you even *think* that is the case?? How can you even *notice* the holidays shown are US-specific? Obviously the US holidays are there to illustrate how it works, not to be used universally. Likewise the numerals and month names. Sheesh.
From: Antares 531 on 19 Feb 2010 10:23 On Fri, 19 Feb 2010 00:02:47 -0800 (PST), Halmyre <flashgordonreceding(a)yahoo.com> wrote: >On 19 Feb, 04:58, "Ray O'Hara" <raymond-oh...(a)hotmail.com> wrote: >> "Andrew Usher" <k_over_hb...(a)yahoo.com> wrote in message >> >> news:65e2a2e7-1aef-4872-97a7-360fa6a10a6a(a)q21g2000yqm.googlegroups.com... >> >> >> >> >> >> > Owing to the inconveniences which attend the shifting of the calendar, >> > and attempting in passing to create a more perfect Church calendar, I >> > say the following: >> >> > 1. That Christmas day should be fixed to a Sunday, and this should be >> > the Sunday between Dec. 21 and 27, and that in all civilised countries >> > the Monday should be considered a holiday, or the Saturday if not >> > normally. >> >> > 2. That similarly Easter day should be fixed to the Sunday which is 15 >> > weeks following Christmas. >> >> > 3. That the leap year rule be changed to have a leap year occur every >> > fourth save that it be delayed when the leap year would start on a >> > Thursday, and that this gives 7 leap years in every 29, which is near >> > enough. >> >> > 4. That the perpetual calendar can be made, by considering the first >> > day of the year of weeks to occur on the Sunday after the Assumption, >> > and if this is the first possible calendar day, it is called week 1, >> > and otherwise week 2, and every year runs through week 53. And this >> > calendar ensures that everything can be fixed to a day of a certain >> > week, in particular the American Thanksgiving must be made 31 days >> > before Christmas. >> >> > 6. This is surely the best possible arrangement that can be made, >> > without disturbing the cycle of weeks or that of calendar days >> > inherited from the Romans. >> >> > Andrew Usher >> >> The calendar has several sources, not just the Rome and the onewe habe in >> fine as it is > >I just wish they'd settle on a date for Easter and be done with it. > Back before it became "Easter" and was still a celebration of Queen Ishtar's glory, with the rabbit and the egg as fertility symbols, what date was used? Gordon
From: Yusuf B Gursey on 19 Feb 2010 10:35 On Feb 19, 4:34 am, James Hogg <Jas.H...(a)gOUTmail.com> wrote: > John Atkinson wrote: > > Halmyre wrote: > >> On 19 Feb, 04:58, "Ray O'Hara" <raymond-oh...(a)hotmail.com> wrote: > >>> "Andrew Usher" <k_over_hb...(a)yahoo.com> wrote in message > > >>>news:65e2a2e7-1aef-4872-97a7-360fa6a10a6a(a)q21g2000yqm.googlegroups.com.... > > >>>> Owing to the inconveniences which attend the shifting of the > >>>> calendar, and attempting in passing to create a more perfect > >>>> Church calendar, I say the following: 1. That Christmas day > >>>> should be fixed to a Sunday, and this should be the Sunday > >>>> between Dec. 21 and 27, and that in all civilised countries the > >>>> Monday should be considered a holiday, or the Saturday if not > >>>> normally. 2. That similarly Easter day should be fixed to the > >>>> Sunday which is 15 weeks following Christmas. 3. That the leap > >>>> year rule be changed to have a leap year occur every fourth > >>>> save that it be delayed when the leap year would start on a > >>>> Thursday, and that this gives 7 leap years in every 29, which > >>>> is near enough. 4. That the perpetual calendar can be made, by > >>>> considering the first day of the year of weeks to occur on the > >>>> Sunday after the Assumption, and if this is the first possible > >>>> calendar day, it is called week 1, and otherwise week 2, and > >>>> every year runs through week 53. And this calendar ensures that > >>>> everything can be fixed to a day of a certain week, in > >>>> particular the American Thanksgiving must be made 31 days > >>>> before Christmas. 6. This is surely the best possible > >>>> arrangement that can be made, without disturbing the cycle of > >>>> weeks or that of calendar days inherited from the Romans. > >>>> Andrew Usher > >>> The calendar has several sources, not just the Rome and the onewe > >>> habe in fine as it is > >> I just wish they'd settle on a date for Easter and be done with it. > > > But, the whole point of Easter is that it has a full moon! You might > > as well scrap the whole thing otherwise. Or are you suggesting that > > we only take holidays at Easter every four years or so, when your > > settled date just happens to correspond with the right lunar phase? > > My Book of Common Prayer makes things easy by pointing out that "the > moon referred to in the definition of Easter Day is not the actual moon > of the heavens, but the Calendar Moon, or Moon of the Lunar Cycle, which > is counted as full on its fourteenth day, reckoned from the day of the > Calendar New Moon inclusive." Also, in a Bissextile Year "the number of > Sundays after Epiphany will be the same, as if Easter Day had fallen one > day later than it really does." the Orthodox (Eastern) churches have a slightly different system. dunno exactly what it is. http://en.wikipedia.org/wiki/Easter Easter .... Easter is a moveable feast, meaning it is not fixed in relation to the civil calendar. The First Council of Nicaea (325) established the date of Easter as the first Sunday after the full moon (the Paschal Full Moon) following the vernal equinox.[3] Ecclesiastically, the equinox is reckoned to be on March 21 (regardless of the astronomically correct date), and the "Full Moon" is not necessarily the astronomically correct date. The date of Easter therefore varies between March 22 and April 25. Eastern Christianity bases its calculations on the Julian Calendar whose March 21 corresponds, during the twenty-first century, to April 3 in the Gregorian Calendar, in which calendar their celebration of Easter therefore varies between April 4 and May 8. > > What could be simpler? > > -- > James
From: Yusuf B Gursey on 19 Feb 2010 10:56 On Feb 19, 5:14 am, Ruud Harmsen <r...(a)rudhar.eu> wrote: > Fri, 19 Feb 2010 10:34:10 +0100: James Hogg <Jas.H...(a)gOUTmail.com>: > in sci.lang: > > >What could be simpler? > > The Jewish calendar. the Jewish Calendar has a complicated algorithm, IIRC refined by the famous 18th cent. mathematician Euler. the complications are due to making sure that certain holidays do not fall on certain days. http://en.wikipedia.org/wiki/Hebrew_Calendar << Hebrew calendar .... Special holiday rules Adjustments are made to ensure certain holy days and festivals do or do not fall on certain days of the week. Yom Kippur Adjustments are made to ensure that Yom Kippur, on which no work can be done, does not fall on Friday (the day prior to the Sabbath) to avoid having Yom Kippur's restrictions still going on at the start of Sabbath, or on Sunday (the day after Shabbat) to avoid having the Shabbat restrictions still going on at the start of Yom Kippur. The Rosh Hashanah postponement rules are the mechanism used to make the adjustments. As Yom Kippur falls on Tishrei 10, and Rosh Hashanah falls on the 1st, the adjustment is made so that Rosh Hashanah does not fall on a Wednesday or Friday. To ensure that Yom Kippur does not directly precede or follow Shabbat, and that Hoshana Rabbah is not on a Shabbat, in which case certain ceremonies would be lost for a year, the first day of Rosh Hashanah may only occur on Mondays, Tuesdays, Thursdays, and Saturdays (the "four gates"). Adjustments are made to ensure that Rosh Hashanah does not fall on the other three days. To achieve that result the year may be made into a short (chaser) year (both Kislev and Cheshvan have 29 days) or full (maleh) year (both Kislev and Cheshvan have 30 days). (see table) The day of the week on which Rosh Hashanah falls in any given year will also be the day on which Sukkot and Shmini Atzeret will occur. >> > > -- > Ruud Harmsen,http://rudhar.com >>
From: António Marques on 19 Feb 2010 10:59
Yusuf B Gursey wrote (19-02-2010 15:35): > the Orthodox (Eastern) churches have a slightly different system. > dunno exactly what it is. Afaik the system is the same, it's March 21 that is different. |