We are currently in the 5766th year of Creation, which is dated from the creation of 'Adam HaRi'shon on the Sixth Day of Creation, which is the first Ro'sh HaShanah. Counting backwards this corresponds to the year 3761 before the "common era." Yet according to the Torah Ro'sh HaShanah is the first day of the seventh month and Nisan (the month of Pesach) is the "first month of the year." Why is this so? Did the Sages of Israel at a certain point drift away or deviate from the ancient Mosaic calendar? Not at all. Nisan is indeed the "first...