Use this palaeographic utility to apply a stated dating, script, abbreviation, codicological, metrological, layout, or condition rule consistently while preparing manuscripts for scholarly review.

Indiction

Indiction sought, 1-15.

Convention

Epoch convention fixing when the indiction turns.

Search from

First year scanned for cycle starts.

Search to

Last year scanned for cycle starts.

Solve which calendar years begin a given indiction (1-15) under a chosen documented epoch - the Greek indiction turning each 1 September from 312, the Roman papal indiction each 25 December from 312, or the Bedan indiction each 1 January from 313 - using exact modulo-15 arithmetic. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Start years

Years in range whose cycle opens with the requested indiction.

Match count

How many such years fall inside the range.

First start

Turnover date of the first matching cycle (YYYY-MM-DD).

• Script and manuscript evidence varies by language, region, institution, period, scribe, material, restoration, and cataloguing convention. A heuristic flag or score is not an authoritative date, hand attribution, reading, provenance, or conservation diagnosis.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Retain page images, scale, foliation, material, provenance, diplomatic transcription, uncertainty, and comparison exemplars; confirm conclusions with codicological context and specialist judgment.

• Regnal English Year Converter

  Convert an English regnal year into its exact calendar span by anniversary arithmetic from each monarch's documented accession or coronation date to death or deposition (Julian calendar, modern year numbering; Henry VI covers only his first reign).

• Byzantine Anno Mundi Converter

  Convert an AD year and month into the Byzantine Anno Mundi year that begins on 1 September (AM = AD + 5509 from September, else AD + 5508) with its 15-year indiction counted from the first indiction of AM 6821 (September 312).

• Grain Hair/Folio Mapper

  Map which folios of a quire show hair or flesh on their rectos under your declared nesting model (uniform rectos of one chosen skin, or alternating so each opening pairs identical skins), as exact leaf lists.