Roman Calendar (Fasti) (羅馬曆)

The calendar of Rome itself: any date named the classical way — Kalendae, Nonae and Idus with the inclusive backward count (the Ides of March; 25 December = a.d. VIII Kal. Ian.), the Nones and Ides shifting to the 7th/15th in March, May, July and October, and THE BISSEXTILE LAW served exactly: in a leap year 24 February becomes ante diem bis sextum Kalendas Martias — the doubled sixth day that gave 'bissextile' its name — with the Terminalia untouched and every naming proven a full-year bijection in tests. Nundinal letters (the stone fasti's A–H paint cycle), AUC years by the Varronian epoch, and the fixed public festivals (Lupercalia, Terminalia, Parilia, Lemuria, Saturnalia…) at their individually-attested dates. HONEST: the per-day characters F/N/C/NP/EN survive as a complete year only on the Fasti Antiates fresco — an image-class source this engine refuses to transcribe on one authority — so that layer is deferred by name, with the category definitions served.

Cost: 2 TIAN Points per call. tRPC procedure roman.date.