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The American Church Dictionary and Cycopedia
Those Feasts of the Church which always occur on the same date such as Christmas Day, Feast of the Epiphany, etc. As some of the Feasts, such as Ascension Day, Whitsun Day, etc., are movable depending on the time Easter is kept. Tables and Rules for the Movable and Immovable Feasts are set forth in the Prayer Book for convenience and to avoid confusion. (See CHRISTIAN YEAR, also FEASTS AND GOSPEL.)
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Miller, William James. Entry for 'Immovable Feasts'. The American Church Dictionary and Cyclopedia. https://www.studylight.org/dictionaries/eng/acd/i/immovable-feasts.html. 1901.
the Fifth Week after Epiphany