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B-first · complete fictional source · full no-image alternativeYear 2 Science · T1 W7–8 · Aids / B first 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.

Question 1: Tell the change in R using the notes.

Question 2: Can W's word “centre” be compared directly with R? What is missing?

Question 3: What is the turned disk trying to explain? What was actually done in the story?

Question 4: Give a new recorder one useful instruction.

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