The Bible does not reveal the exact date of Jesus’ birth. It does say, however, that he was born “in the days of Herod the king.” (Matthew 2:1) Many Bible scholars believe that Herod died in the year 4 B.C.E. and that Jesus was born before then​—perhaps as early as 5 or 6 B.C.E. They base their conclusions about Herod’s death on statements by the first-century Jewish historian Flavius Josephus.b

According to Josephus, shortly before King Herod died, there was an eclipse of the moon. Bible scholars point to a partial lunar eclipse on March 11, 4 B.C.E., as proof that Herod must have died in that year.