If parallax measurements used to establish the scale for the nearest stars were inaccurate, what would happen to measurements based on the highest rungs?

Answer

The error would compound and propagate up every successive rung of the ladder.

Because each rung calibrates the next, any systematic error present in the fundamental geometric measurements at the bottom of the ladder will multiply and compound as that scale is used to calibrate increasingly distant phenomena.

If parallax measurements used to establish the scale for the nearest stars were inaccurate, what would happen to measurements based on the highest rungs?

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