<i>The modern history of T invariance begins in 1956</i>.<p>Or 1781, when <i>Critique of Pure Reason</i> was published. Kant proposed that time was an empirical fact based on experiencing events in time being a precondition of all human experience. The tradeoff for a well reasoned non-skeptical position was that we give up claims to &quot;really really&quot; know how things really are independent of human experience...i.e we give up claims to potential omniscience.<p>That we normally take &quot;knowledge&quot; to mean human knowledge, doesn&#x27;t change that this is what we mean. Or to put it another way, what would time be for a computer with knowledge or as the article mentions for creatures that experience time backward?