Because the Star was a Great Sign from Almighty God, in the sky, on that Holy Night Jesus was Born. Also, the three kings followed that star until they found the Infant Jesus.
the North Star led the three wise men to the birth of Jesus
It was His star. Matthew 2: 1-2 Now when Jesus was born in Bethlehem of Judaea in the days of Herod the king, behold, there came wise men from the east to Jerusalem, Saying, Where is he that is born King of the Jews? for we have seen his star in the east, and are come to worship him.
In the new testament - at the start of Luke's Gospel and Matthew's Gospel. Luke tells the story of the shepherds, angels and the details surroding the birth. Matthew tells of the Wise men, the star of Bethlehem and the slaughter of the innocents by Herod.
The star that shown the night of Jesus' birth was in the east.
a star
Matthew and Luke. Both record the story of Jesus' birth. Matthew explains Jesus' lineage from Abraham through David. This shows Jesus in the line of Abraham and David. By implication, he is the legal son of Joseph by adoption.
the north star
Alone among the gospels, Matthew says that magi followed a star from the east, to Jerusalem and then to Bethlehem, where the star identified the exact house in which the baby Jesus lay.John Shelby Spong (Born of a Woman: A Bishop Rethinks the Birth of Jesus) says that among people he knows in New Testament circles, the universal assumption is that the magi were not actual people. Matthew was clearly writing Christian midrash.Furthermore, the scribes who recorded every strange celestial event in Palestine and elsewhere throughout the Roman Empire and the Persian Empire never mentioned any strange star during the reign of King Herod. There was no star that could have guided the magi to the home of Jesus.However, there is a sound explanation for the Star of Jesus. Matthew's Gospel is believed to have been written during the 80s of the first century. A star did appear shortly beforehand, in the 60s, and caused widespread religious speculation at the time. The author of Matthew was almost certainly inspired by that star.
Presumably this represents the star that heralded His birth according to the Bible.
The Gospels of Matthew and Luke each has a visitor to the baby Jesus in order to worship him.Matthew has the magi ('wise men') follow a star to worship Jesus and bring him gifts.In keeping with its theme of poverty, Luke has poor shepherds visit Jesus to worship him. The shepherds knew nothing of the star that Matthew has the magi follow, but were instead told of Jesus' birth by angels.
Since we do not know the actual date of Jesus' birth, we can not know his star sign.
Only the magi, or wise men, of Matthew's Gospel saw the star in the east when Jesus was born. Scribes and astrologers, in Rome, Egypt, Palestine, Persia and even China, failed to mention any such star in their careful records of all unusual celestial phenomena. In fact, Ian Wilson (Jesus: The Evidence) says the hard reality is that the Matthew nativity story does not offer sufficient historicity for anyone to be confident that there was a star at all