Sukuyo Ryohan period (Ryōhan): method and limitations
A Sukuyo Ryohan period (凌犯期間) requires a declared month, first-day weekday, and period table; it is not the ordinary three-nine cycle.
Overview
A period report needs its table row and date boundaries. Six relative positions alone cannot establish that the period is active.
At a glance
- Modern term
- 凌犯期間
- Required for a calendar
- Month, first-day weekday and period table
- OpenFate scope
- No verified ryōhan-period output here
A period is more than a label
The practitioner source linked below derives periods from a lunisolar month’s first weekday and a separate correspondence table.
A birth mansion alone therefore cannot identify the start and end dates.
Distinguish the classical passage
T1299 discusses luminaries approaching or occupying mansion positions. A modern calendar table is a separate implementation claim.
Do not assume that a shared word proves the rules are identical.
What a reproducible report needs
Record the calendar convention, month, first-day weekday, matching table row and date boundaries.
A highlighted date without those details is difficult to compare with another source.
Do not infer unsupported output
The local product includes six named relative positions, but those positions alone do not verify an active ryōhan period.
This guide does not fabricate an annual calendar or claim a product feature that has not been verified.
Use caution without fatalism
A named period does not prove that misfortune will occur. Practical risks should be assessed from their actual causes.
Do not postpone necessary actions or blame a person because a calendar uses alarming language.
Audit a published period range
Ask for the lunisolar month, weekday of day one, exact practitioner-table row, start date, end date, timezone and calendar convention. Recalculate the row before accepting the highlighted span.
Without those inputs, this page cannot verify that a current date lies in Ryohan; a confident forecast would be unsupported.
Sources and editorial basis
- 宿曜經 · T1299 卷下卷下 end of「三必祕要法」: 七曜陵犯守逼 astronomical language, not proof that a modern period table is identical.The three-nine passage supplies historical relative-position terminology. It is not evidence that a modern relationship outcome is determined by a mansion pair.
- OpenFate Sukuyo calculator and calculation conventionEditorial code check 2026-09-10, policy 1.0.0: ryohan; policy.ts, constants.ts, engine.ts and traditional-cycles.ts. Product settings are not an independent historical authority; practical examples are OpenFate editorial applications.Product-specific input and output reference. Editorial checks also inspected policy 1.0.0 and the month-start constants on 2026-09-10; those implementation checks are not an independent traditional authority.
- 八雲院：凌犯期間と六害宿「凌犯期間と六害宿の求め方」and「朔日の曜日と期間の対応表」; cited only for the additional calendar condition, not the predicted harms.A practitioner’s own period-table convention. Cited only for the separate period condition, not its predicted harms or a claim that OpenFate implements the calendar.