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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