> In order to count as knowledge, it has to be justified in the right way, which, alas, nobody has been able to specify exactly what that way should be. First

> In order to count as knowledge, it has to be justified in the right way, which, alas, nobody has been able to specify exactly what that way should be. First of all you have to be able to test your knowledge, you would test that the clock is correct for every minute of the day. If you missed any minutes then your knowledge is incomplete, you instead have probable knowledge, (using the same methods that physics uses to decide if an experimental result is real, you can assign a probability that the clock is correct). Also, since when is knowledge absolute? You can never be completely certain about any knowledge, you can only assign (or try to assign) a probability that you know something, and testing your belief greatly increases the probability. (PS. Thank you for the reply.)