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B-first · The park-frame archive · educator account, criteria and next teachingYear 2 Science · T1 W7–8 · Staff · Staff / B first

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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