Weather

This weather lesson has one permitted task: analyse a historical case record without turning it into a forecast.

Current rain, clearing, storm, heat, cold, drought, travel, agricultural, and safety decisions belong to meteorological and other appropriate current sources. A historical chart cannot supply those facts.

Use a five-lane case worksheet

Lane	Record	Boundary
Source question	The exact question in the cited text	Do not broaden its place, time, or consequence
Chart facts	Reproducible construction fields	Do not call them weather observations
Text interpretation	What the source’s author says about the chart	Do not present it as universal doctrine
Recorded observation	What the source text later reports	Treat it as a source record, not proof
Present-day use	Historical study only	No forecast or practical advice

Keeping these lanes separate is the learner artifact.

Weather chapter case

Example type: documented textual same-day weather-observation case.

Zengshan Buyi asks about whether the sky would be clear or cloudy that day. Its printed chart supplies the fields for this reader-facing reconstruction:

Field	Recorded value	Evidence class
Source task	Same-day clear/cloudy observation	Primary-source record
Primary chart	Hexagram 3	Directly observed chart fact
Changed chart	Hexagram 19	Directly observed chart fact
Moving lines	Bottom-up lines 2 and 5	Directly observed chart fact
Source observation	The text later records an observation at Xu hour	Source record, not validation
Permitted conclusion	The source and mechanics can be compared reproducibly	Historical study only

The table makes the chart reconstruction inspectable. It does not verify the weather, the text’s interpretation, or predictive efficacy.

Reproduce the boundary

Complete these steps:

1. Copy the source question without changing “that day” into a general weather rule.
2. Reproduce Hexagram 3 changing to 19 and mark lines 2 and 5.
3. Label each statement source record, chart fact, or text interpretation.
4. Record the source’s later observation in its own lane.
5. Write not a current forecast in the present-day-use field.

The task is complete when another learner can identify which statements came from the text and which came from deterministic chart construction.

Counterexample: marker becomes forecast

Invented counterexample; no weather outcome.

A learner notices one moving line and writes: “This marker means it will rain here tomorrow.” Reject the sentence. It changes a historical same-day source task into a new place, new date, new output, and unsupported rule. Use an appropriate current meteorological source instead.

Even a close match between a historical interpretation and a reported observation would remain one textual case. It is not proof of a forecasting method.

Trap and stopping condition

Do not extract a rain, clearing, storm, drought, hour, day, or month rule from this one record. Do not convert chart strength or timing candidates into probabilities. Do not issue a user-facing forecast.

Stop whenever the requested output concerns current or future conditions. The worksheet may preserve the historical record; it may not advise action.

Claim sources: Zengshan Buyi, checked composite, volume 2, “Tianshi” (Weather), printed p. 90/PDF physical p. 91; Chinese Text Project work ctp:ws157683, displayed paragraphs 996–1003; and the public Wikisource chapter transcription. The mechanics table is reconstructed directly from the printed chart and supports construction only, not weather truth or efficacy.

Next, use the same scope discipline to split a question that asks for everything at once: Lifelong and Broad Questions.