Liturgical Calendar
| (require liturgical-calendar) | package: liturgical-calendar |
The liturgical-calendar library provides functions to compute the dates of Easter and other Christian holidays. It uses the representation of dates from Gregor: Dates and Times. Currently, liturgical-calendar supports the calendar used primarily by churches originating in the Western half of the Roman empire: see the introduction for details.
1 Introduction
Coming soon ...
2 Reference
procedure
(year->advent-start year) → (and/c date? sunday?)
year : exact-positive-integer?
procedure
(year->christmas year) → date?
year : exact-positive-integer?
procedure
(year->epiphany year) → date?
year : exact-positive-integer?
procedure
(year->candlemas year) → date?
year : exact-positive-integer?
procedure
(year->ash-wednesday year) → (and/c date? wednesday?)
year : exact-positive-integer?
procedure
(year->easter year) → (and/c date? sunday?)
year : exact-positive-integer?
procedure
(year->ascension-thursday year) → (and/c date? thursday?)
year : exact-positive-integer?
procedure
(year->pentecost year) → (and/c date? sunday?)
year : exact-positive-integer?
procedure
(year->trinity-sunday year) → (and/c date? sunday?)
year : exact-positive-integer?
Bibliography
Reinhold Bien. Gauß and Beyond: The Making of Easter Algorithms. Archive for History of Exact Sciences 58(5), pp. 439–452, 2004. https://doi.org/10.1007/s00407-004-0078-5 |
Episcopal Church. The Book of Common Prayer. 1979 edition. New York: Church Publishing, 2007. https://perma.cc/BCC2-C9CY (PDF). Web version at https://bcponline.org. See in particular “The Calendar of the Church Year,” pp. 15–33 (web), and “Tables and Rules for Finding the Date of Easter Day,” pp. 880–885 (web). |
Jean Meeus. Astronomical Algorithms. 2nd edition. Richmond: Willmann-Bell, 1998. |
Faith Wallis. Introduction, appendices, and commentary. In The Reckoning of Time, by the Venerable Bede, translated by Faith Wallis. Translated Texts for Historians volume 29. Liverpool, UK: Liverpool University Press, 1999. https://isidore.co/calibre/#book_id=7150&library_id=CalibreLibrary&panel=book_details |