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Precision and accuracy are not the same thing,
https://www.ncsu.edu/labwrite/Experimental Design/accuracyprecision.htm
Like the actual sea level.
Like how close two measurements are two each other, but not to the actual sea level.
No, precision rather than accuracy is what we are interested in here. We don't know the actual sea level (however you choose to define it), nor are we particularly concerned with it. What we want to know is not its absolute value, but the rate at which it is changing. Sufficiently precise measurements tell us this.