Liturgical Calendar
1 Introduction
2 Reference
year->advent-start
year->christmas
year->epiphany
year->candlemas
year->ash-wednesday
year->easter
year->ascension-thursday
year->pentecost
year->trinity-sunday
Bibliography
8.3

Liturgical Calendar

Philip McGrath <philip@philipmcgrath.com>

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

    2 Reference

    Bibliography

1 Introduction

Coming soon ...

Gregor: Dates and Times

Episcopal Church (2007)

Meeus (1998)

Bien (2004)

Wallis (1999)

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->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