Pesachim 93b - Faith and Fact: When is Dawn

Using the discussion about when precisely dawn is, we explore the two categories of facts that Halacha deals with: Empirical facts based on observation and measurement, and Halachik facts transmitted to us from Sinai through the Halachik process. It is important to understand these differences and to know with which category of fact we are dealing when making Halachik determinations.