Porter, Dot2023-05-232022-10-112022-10-112022-10-11https://repository.upenn.edu/handle/20.500.14332/46795youtubeEaster -- Early works to 1800Perpetual calendars -- Early works to 1800Perpetual calendarsEasterCodicesDevotional calendarsDiagramsManuscripts LatinManuscripts RenaissanceHistory of ChristianityRenaissance StudiesPenn Library's LJS 420 - [Perpetual calendar with Metonic cycle]. (Video Orientation)Media