“Time and reason are functions of each other,” Ursula K. Le Guin wrote in her philosophical novel exploring why honoring the continuity of past and future is the wellspring of moral action. The human animal is indeed a temporal creature, our experience of time at the center of our psychology. Locating ourselves is therefore largely a matter of locating ourselves in the stream of time — diurnal, civilizational, and cosmic. It is hard enough to grapple with the micro end…