The Calendar,
Computed.

Ask for any date and the engine answers with the season, the week within it, the rank of the celebration, the liturgical colour, the psalter week and the saint if the day belongs to one. The movable feasts are computed rather than tabulated, so the answer is as good for 2031 as for this morning — and the precedence rules decide which celebration wins when two fall together, which is the part that is genuinely hard to do by hand.

curl "https://api.torchandlily.com/v1/ordo?date=2026-12-25" \
  -H "X-API-Key: tl_your_key_here"

{
  "date": "2026-12-25",
  "season": "CHRISTMASTIDE",
  "week": null,
  "psalter_week": null,
  "color": "WHITE",
  "color_hex": "#C8B88A",
  "rank": "SOLEMNITY",
  "title": "The Nativity of the Lord (Christmas)",
  "is_saint_feast": false,
  "saint_id": null,
  "saint_slug": null,
  "saint_name": null,
  "commemorations": []
}