Calendar sources

The calendar follows the 1962 Roman Missal. Principal observances, ranks, colors, and identified commemorations come from Missale Meum, by Marcin Molenda, drawing on Divinum Officium. Its project documentation makes the API available for use.

1962 Ordo is a secondary commemoration check. A matching count alone is insufficient to add an observance. Source disagreements are reviewed against period sources, including Rev. Patrick L. Murphy’s 1960 edition of the General Rubrics, 109–114. The downloads contain short calendar facts and source references, not prayer texts.

Historical fasting and abstinence notes

These describe 1962 U.S. practice and are not current obligations. They retain the calendar’s existing context and source references.

• Notre Dame Religious Bulletin, March 2, 1962
• 1917 Code of Canon Law
• Missale Romanum, 1962

Source project notice

The Missale Meum software license is retained below and in the calendar file’s source-notice field. It does not assert ownership of the underlying traditional liturgical texts.

Missale Meum: https://www.missalemeum.com
Source project: https://github.com/mmolenda/missalemeum
MIT License
Copyright (c) 2022 Marcin Molenda

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