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Quantum distance ladder
@Qmechanic, The lecture explains how Greeks measured the radius of earth, then used that to measure the distance to the moon, then used that to measure the distance to the sun, etc. I assumed that my question would be clear without watching the lecture.
@BrandonEnright I wonder if that could be offset by the number of loops. That is, could, instead of a plain wire, the coil be made of a thin track in a similar way to a circuit board?