clay@claysturner.com wrote:> On Mar 21, 6:12 pm, Richard Owlett <rowl...@atlascomm.net> wrote: > >>c...@claysturner.com wrote: >> >>>Hello All, >>>As a bunch of DSPers we like to calculate things. >> >>I'll agree so far. >> >> > And one that is somewhat challenging is the date of Easter. >> >>Unsupported. > > > > Unsupported? [snip]Isn't that proof that I did not proofreed carefully. I meant "undisputed"
OT: Calculating date of Easter
Started by ●March 21, 2008
Reply by ●March 22, 20082008-03-22
Reply by ●March 22, 20082008-03-22
Richard Owlett wrote:> clay@claysturner.com wrote: > >> On Mar 21, 5:30 pm, Tim Wescott <t...@seemywebsite.com> wrote: >> >>> c...@claysturner.com wrote: >>> >>>> Hello All, >>> >>>> As a bunch of DSPers we like to calculate things. And one that is >>>> somewhat challenging is the date of Easter. It has an astronomical >>>> origin - specifically it is the 1st Sunday on or after the 1st full >>>> moon after the 1st day of Spring (Northern Hemisphere). Of course an >>>> accurate calculation involving the Moon can be quite extensive, For >>>> example E. W. Brown's lifework on the moon contains unbelievably long >>>> formulae. For example to find the moon's longitude he gives an >>>> equation with 1650 trigonometric terms! But the clergy took some >>>> shortcuts such as saying the 1st day of Spring is always Mar 21, even >>>> though it usually occurs on Mar 20 and may occur on Mar 19.. >>> >>>> During the late 1800s, a neat method involving only integer math was >>>> devised to give the date of Easter. Here is the code snippet I put >>>> together using this method. Just thought you all might be interested. >>>> It just goes to show there were some quite clever people back then. >>> >>>> Clay >>> >>> Western-tradition Easter. Doesn't the Eastern Orthodox church have >>> Easter on a different day? >>> >>> -- >>> >>> Tim Wescott >>> Wescott Design Serviceshttp://www.wescottdesign.com >>> >>> Do you need to implement control loops in software? >>> "Applied Control Theory for Embedded Systems" gives you just what it >>> says. >>> See details athttp://www.wescottdesign.com/actfes/actfes.html- Hide >>> quoted text - >>> >>> - Show quoted text - >> >> >> Tim, >> >> They quite likely do. There are many different historical calendars >> that are still used by various religions. >> >> Clay >> > > Gregorian vs JulianEaster is a nearly fixed holiday in the Babylonian calender. "Nearly" because sometimes, as this year, there's an intercaliary month and in general because it's always delayed till Sunday. I suppose it's nearly fixed in any lunar calendar. Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
Reply by ●March 22, 20082008-03-22
clay@claysturner.com wrote:> On Mar 21, 6:15 pm, Richard Owlett <rowl...@atlascomm.net> wrote: >> c...@claysturner.com wrote: >>> On Mar 21, 5:30 pm, Tim Wescott <t...@seemywebsite.com> wrote: >>>> c...@claysturner.com wrote: >>>>> Hello All, >>>>> As a bunch of DSPers we like to calculate things. And one that is >>>>> somewhat challenging is the date of Easter. It has an astronomical >>>>> origin - specifically it is the 1st Sunday on or after the 1st full >>>>> moon after the 1st day of Spring (Northern Hemisphere). Of course an >>>>> accurate calculation involving the Moon can be quite extensive, For >>>>> example E. W. Brown's lifework on the moon contains unbelievably long >>>>> formulae. For example to find the moon's longitude he gives an >>>>> equation with 1650 trigonometric terms! But the clergy took some >>>>> shortcuts such as saying the 1st day of Spring is always Mar 21, even >>>>> though it usually occurs on Mar 20 and may occur on Mar 19.. >>>>> During the late 1800s, a neat method involving only integer math was >>>>> devised to give the date of Easter. Here is the code snippet I put >>>>> together using this method. Just thought you all might be interested. >>>>> It just goes to show there were some quite clever people back then. >>>>> Clay >>>> Western-tradition Easter. Doesn't the Eastern Orthodox church have >>>> Easter on a different day? >>>> -- >>>> Tim Wescott >>>> Wescott Design Serviceshttp://www.wescottdesign.com >>>> Do you need to implement control loops in software? >>>> "Applied Control Theory for Embedded Systems" gives you just what it says. >>>> See details athttp://www.wescottdesign.com/actfes/actfes.html-Hide quoted text - >>>> - Show quoted text - >>> Tim, >>> They quite likely do. There are many different historical calendars >>> that are still used by various religions. >>> Clay >> Gregorian vs Julian- Hide quoted text - > > There are more calendars than that. The Jewest calendar is also luni- > solar where the months have 29 or 30 days and the year has 12 or 13 > months. The Jewish Easter always falls on 15 Nisan. The Jewest common > year may have 353,354, or 355 days. The leap year will have 383,384, > or 385 days. > > The Islamic calendar is purely lunar with 12 lunar months making up a > year. This is without regard to the tropical year. 12 lunar months > will end up having 354 or 355 days. >"Jewish Easter"? Is that anything like "Moslem Sukkot", or "Christian Ramadan"? -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" gives you just what it says. See details at http://www.wescottdesign.com/actfes/actfes.html
Reply by ●March 22, 20082008-03-22
Tim Wescott wrote: ...> "Jewish Easter"? Is that anything like "Moslem Sukkot", or "Christian > Ramadan"?Isnt that when the stores are stocked with Easter Egg Matzo? Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
