# B-first · The park-frame archive · educator account, criteria and next teaching

**Eligibility:** After Days 33–34; same-place/turn model concepts explicitly familiar from 03–04. **Complete source:** An original invented three-dot star pattern is shown intact in fixed ground-frame R. Early on a fictional evening it is above the low rail at the right; later it is above the centre; still later above the left edge. Record W uses a newly moved frame V and says only “above centre”; no relation of V to R is given. Separately a marked unshaded Earth disk is turned against a stationary facing guide by the fictional model maker. No real constellation, compass direction, speed, latitude or actual local sky observation is supplied.

## Exact prompts and meaning

1. **Tell the change in R using the notes.** Expected: right→centre→left at the stated ordered times, whole pattern intact relative to R. Criterion: preserves the source's positions/time/reference, without substituting an assumed astronomical path. Next: unrelated marker cards below/level/above a named paper window; read their actual order before describing.
2. **Can W's word “centre” be compared directly with R? What is missing?** Expected: not directly; frame relation/change is unspecified. Criterion: asks for a reference mapping rather than equating identical location words. Next: place two paper origins visibly apart and ask what relation a helper would need to compare their labels.
3. **What is the turned disk trying to explain? What was actually done in the story?** Expected: Earth's turning changes ground view; fictional maker turned a paper model, not a child observing stars or proving their physical motion. Criterion: separates explanatory model operation, supplied ground records and actual actor. Next: ask a helper to perform a child-directed disk turn and name only that actual paper action plus its explanatory purpose.
4. **Give a new recorder one useful instruction.** Expected: keep R/familiar reference fixed, attach named object/time/source, record unavailable/missing honestly; no forced night viewing. Criterion: method addresses the identified comparison problem safely. Next: rehearse one instruction on a table with a new frame, record whether it was followed, no sky outcome inferred.

## Capture and support

Keep the first response before help. Read neutrally or scribe exactly; note actual communication, operator, prompt and exposure. Source interpretation does not establish actual sky conduct. Record one descriptive state and reason: meaning evidenced here; meaning after named help; unclear here; unobserved on this route. No total or official grade conversion.

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