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Lutheran Church Year
Dates of "Ostersonntag" (Easter Sunday, 1^{st} Day of Easter) 
Easter is the most important annual religious feast in the Christian liturgical year. According to Christian scripture, Jesus was resurrected from the dead on the 3^{rd} day after his crucifixion. Some Christians celebrate this resurrection on Easter Day or Easter Sunday (also Resurrection Day or Resurrection Sunday), 2 days after Good Friday and three days after Maundy Thursday. The chronology of his death and resurrection is variously interpreted to be between AD 26 and AD 36. Easter also refers to the season of the church year called Eastertide or the Easter Season. Traditionally the Easter Season lasted for the 40 days from Easter Day until Ascension Day but now officially lasts for the 50 days until Pentecost. The first week of the Easter Season is known as Easter Week or the Octave of Easter. Easter also marks the end of Lent, a season of fasting, prayer, and penance.
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. 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 twentyfirst century, to April 3 in the Gregorian Calendar, in which calendar their celebration of Easter therefore varies between April 4 and May 8.
Easter is linked to the Jewish Passover not only for much of its symbolism but also for its position in the calendar. In most European languages the feast called Easter in English is termed by the words for passover in those languages and in the older English versions of the Bible the term Easter was the term used to translate passover. 
Readings: Epistle: 1 Corinthians 5: 68; Gospel: Markus 16: 18 
Dates in the Lifetime of J.S. Bach 
All dates are in ISO 8601 format: YYYYMMDD.
Abbreviations of German weekdays: Sonntag, Montag, Dienstag, Mittwoch, Donnerstag, Freitag, Samstag. 
16850422 So
16860414 So
16870330 So
16880418 So
16890410 So
16900326 So
16910415 So
16920406 So
16930322 So
16940411 So
16950403 So
16960422 So
16970407 So
16980330 So
16990419 So
17000411 So
17010327 So
17020416 So
17030408 So
17040323 So
17050412 So
17060404 So
17070424 So
17080408 So
17090331 So
17100420 So
17110405 So
17120327 So
17130416 So
17140401 So
17150421 So  Cantata BWV 31 Der Himmel lacht! Die Erde jubilieret (1^{st} performance, Weimar)
17160412 So
17170328 So
17180417 So
17190409 So
17200331 So
17210413 So
17220405 So
17230328 So
17240409 So  Cantata BWV 31 Der Himmel lacht! Die Erde jubilieret (2^{nd} performance, Leipzig) + Cantata BWV 4 Christ lag in Todesbanden (2^{nd} performance, Leipzig)
17250401 So  OsterOratorium BWV 249 Kommt, eilet und laufet (1^{st} performance, Leipzig) + Cantata BWV 4 Christ lag in Todesbanden (3^{rd} performance, Leipzig) + G.P. Telemann: Cantata Der Herr ist König, TWV 8:6 (1^{st} performance, Leipzig) (?)
17260421 So  J.L. Bach: Cantata BWV 15 Denn du wirst meine Seele (1^{st} performance, Leipzig)
17270413 So
17280328 So
17290417 So
17300409 So
17310325 So  Cantata BWV 31 Der Himmel lacht! Die Erde jubilieret (3^{rd} performance, Leipzig)
17320413 So
17330405 So
17340425 So
17350410 So
17360401 So
17370421 So
17380406 So  OsterOratorium BWV 249 Kommt, eilet und laufet (2^{nd} performance, Leipzig) (?)
17390329 So
17400417 So
17410402 So
17420325 So Mariä Verkündigung
17430414 So
17440329 So
17450418 So
17460410 So
17470402 So
17480414 So
17490406 So  OsterOratorium BWV 249 Kommt, eilet und laufet (4^{th} performance, Leipzig)
17500329 So 
Vocal works with no definite date 
(17071708?)  Cantata BWV 4 Christ lag in Todesbanden (1^{st} performance, Mühlhausen)
(17431746)  OsterOratorium BWV 249 Kommt, eilet und laufet (3^{rd} performance, Leipzig)
(?)  G.P. Telemann: Cantata BWV 160 Ich weiß, daß mein Erloser lebt (not known if performed by J.S. Bach) 

Sundays and Holidays in the Lifetime of J.S. Bach 
Prepared by Dr. Georg Fischer (April 2007), Aryeh Oron (March 2010)
Contributed by Dr. Georg Fischer (March 2010)
Please direct any questions or comments to: Dr. Georg Fischer 

