Pedant here!
> NIST researchers have made the most accurate atomic clock to date — one that can measure time down to the 19th decimal place.
That's precision, not accuracy.
> NIST researchers have made the most accurate atomic clock to date — one that can measure time down to the 19th decimal place.
That's precision, not accuracy.
A single measurement cannot be precise. Precision is a measure of how close multiple measurements are to one another. Accuracy is how close a single measurement is to its true value.
A clock that can measure a point in time to 19 decimal places with respect to its true value is accurate.
A single measurement can _never_ be precise, it is simply not possible.
You can be accurate, precise, or both.
Said clock may be precise, but not accurate.
it's precision