Sukuyo dark week: identify the rule before the forecast
Sukuyo dark week is an interpretive label that needs a named source, reference point, cycle, and boundaries; it is not automatically seven days.
Overview
Before accepting a date range, ask what the named week counts and where it begins. Keep an undefined rule explicitly unresolved.
At a glance
- Check the source
- Definition of the named week
- Three-nine groups
- Nine positions each
- Black fortnight
- Lunar days 16–30, a different field
Ask what week means
A modern source may use week language for a segment of a mansion cycle rather than seven weekdays.
Record the beginning, ending and reference point before treating the term as a calendar interval.
Do not confuse darkness and lunar phase
The black fortnight is a named half of the lunar month. The phrase dark week does not automatically mean that half.
The labels belong to different classification systems unless a source explicitly connects them.
Check the underlying positions
A three-nine group contains nine named relative positions. Any modern label attached to that group should preserve those positions.
Do not replace the source sequence with seven consecutive dates simply because the translation says week.
Current product boundary
OpenFate exposes the three-nine positions under its declared method. That does not verify every modern dark-week calendar definition.
This page deliberately supplies no invented current dates or universal start rule.
A sensible response to an alarming label
Identify the practical issue you are worried about and gather relevant information. A calendar label is not evidence that something bad will happen.
If a source cannot explain its rule, retain that uncertainty instead of intensifying the prediction.
Minimum definition audit
Before publishing dates, require a named source, reference mansion, complete position sequence, start rule, end rule, calendar convention and a worked example that can be replayed.
The current source set does not provide a verified universal dark-week definition, so this page explains the gap rather than fabricating a schedule.
Sources and editorial basis
- 宿曜經 · T1299 卷上卷上「三九祕宿品第三」and「黑白分品第七」: nine-position groups and lunar half-months are distinct; modern dark-week definition remains pending.Historical text for mansion names and calendar tables. Its table is not identical to OpenFate’s modern 27-mansion lookup; it does not establish predictive validity.
- OpenFate Sukuyo calculator and calculation conventionEditorial code check 2026-09-10, policy 1.0.0: dark-week; 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.