Astonishing Dogmatic Hinduism posits a complex system of units of time, unknown to the Western world, ranging from the unimaginably short to the unimaginably long. Notably, it includes alternating periods when the universe does, and does not, exist. The briefest unit is the truti, measuring 308.6 nanoseconds. I can't imagine what moved people to think of such dimensions; or what practical usefulness this unit could have; or how the ancients would have managed to measure it.