Curious to know how this possibly made it to the front of HN.
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.
I used to lay down in the living room and transcribe BASIC from COMPUTE! magazine into it, and customize them, and that's how I learned to program.