Did You Know? The pre-Socratic philosopher Thales (TAY-lees), who lived c. 624-546 B.C., predicted an eclipse that by modern methods we know to have taken place on May 28, 585 B.C. This use of natural reason is sometimes employed to mark the beginning of philosophy as it is (sort of) understood today. At least, I used this date to mark its birthday for my pupils when I was a grad student in the subject back in college. 🙂 LEARN MORE.