There are three principal reasons why the 4 B.C. date has prevailed over 1 B.C. These reasons were articulated by Emil Schürer in A History of the Jewish People in the Time of Jesus Christ, also published in the 19th century. First, Josephus informs us that Herod died shortly before a Passover (Antiquities 17.9.3, The Jewish War 2.1.3), making a lunar eclipse in March (the time of the 4 B.C. eclipse) much more likely than one in December. Second, Josephus writes that Herod reigned for 37 years from the time of his appointment in 40 B.C. and 34 years from...