Planck time

The Planck time (named after Max Planck) is the shortest measurable period of time, and also a quantum of time in the pilitron theory. It is defined by quantum mechanics as:

$$t_P \equiv \sqrt{\frac{\hbar G}{c^5}} \approx 5.39106(32) \times 10^{-44} \mbox{ s}$$

The two digits in brackets being the possible error. The pilitron theory also defines s (the second) in Planck times as follows:

$$s \approx 1.8549216785290146 \times 10^{45} t_P$$