why did this aforesaid star was born?
According to the Gospel of Matthew, the star was born to lead the Magi to the birth place of Jesus.
Introduction
The Star of Bethlehem, or Christmas Star, appears only in the nativity story of the Gospel of Matthew where "wise men from the East" (Magi) are inspired by the star to travel to Jerusalem
who told the magi to follow the star Matthew's account suggests that the Magi knew from the star that the "king of the Jews" had been born before they arrived in Jerusalem who is this magi? The Magi (often translated as "wise men"), but is more accurately astrologers. who is this star? Other writers highly suggest that the star was a comet. Halley's Comet was visible in 12 BC and another object, possibly a comet or nova, was seen by Chinese and Korean stargazers in about 5 BC what is this aforesaid comet? Halley's Comet or Comet Halley, officially designated 1P/Halley, is a short-period comet visible from Earth every 75–76 years.
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wiki:13085470
Star of Bethlehem [SEP] Introduction
The Star of Bethlehem, or Christmas Star, appears only in the nativity story of the Gospel of Matthew where "wise men from the East" (Magi) are inspired by the star to travel to Jerusalem. There, they meet King Herod of Judea, and ask him: Herod calls his scribes and priests who quote to him that a verse from the Book of Micah interpreted as a prophecy, states that the Jewish Messiah would be born in Bethlehem to the south of Jerusalem. Secretly intending to find and kill the Messiah in order to preserve his own kingship, Herod invites the wise men to return to him on their way home.