Liturgical basis
Roman rite
The overlay follows Roman-rite season and feast logic, then maps that onto the chosen local civil day.
Catholic Explainer
Catholic Liturgical Guide
This page explains the Roman-rite Catholic overlay as a daily liturgical layer parallel to the Orthodox one: provider-backed where possible, curated where needed, and explicit about locality and jurisdiction assumptions.
Overlay output for this day
Key fields
Structured details
Interpretation notes
Try this overlay on a real day
Choose a day and the page will show the full overlay output instead of only its metadata contract.
The simple rule
Catholic observance here is a Roman-rite liturgical overlay on top of civil dating. It follows the liturgical year, holy-day and feast structure, and a first-vespers boundary for Sundays and solemnities rather than acting like a separate civil calendar.
Comparison surface
Local civil date
Users can compare Catholic liturgical output directly with Gregorian civil dating and with the Orthodox overlay on the same page.