Many scholars believe that Jesus Christ was born in Bethlehem between 6 B.C. and 4 B.C. Scholars base this chronology on passages from the Bible and historical events.
Matthew 2:1 states that Herod ruled Judah when Jesus was born. Historians believe that Herod died in 4 B.C. Before Herod's death, he ordered all boys who were 2 years old or younger to be killed, and so Jesus could have been 2 years old in 4 B.C.
Support for this chronology in the Bible comes from Luke 2:1-2, which notes a census in approximately 6 B.C. Luke 3:23 also describes Jesus as "about thirty years of age" between 27 A.D. and 29 A.D. Some astronomical support is that the Star of Bethlehem may have been a comet that passed Earth in 5 B.C.