Roy D. Kotansky* argues in ‘The Star of the Magi: Lore and Science in Ancient Zoroastrianism, the Greek Magical Papyri and St. Matthew’s Gospel’ that the pericope in the M Source regarding the star of Bethlehem reflects Zoroastrian traditions about Magi who divine from a star seen falling to Earth the birth of a coming saviour, who will deliver the world from bondage and inaugurate the blessing of a new millennium. Following Nikos Kokkinos’ chronology for Jesus’ birth, Kotansky argues that the star of Bethlehem is not part of a midrash fulfilling the prophecy that ‘a star shall come forth out of Jacob’ (Num 24.17), but Halley’s comet, which appeared twice (perihelion) in the sky in 12 bce during the rulership of Herod the Great. According to Kotansky, the author of the Gospel of Matthew integrated Zoroastrian interpretations of this astronomical phenomenon with Jewish messianic and Bethlehemic segments such as Mic 5.2 (Matt 2.6). As Kotansky acknowledges, his interpretation results in two Synoptic dates for Jesus’ birth – (1) 12 bce with the appearance of the comet (Matt 2.2, 9, 10), and (2) 6/7 ce at the time of the census by Quirinius (Luke 2.2). This essay explores whether the messianic and Bethlehemic segments of Matthew 2 refer to a lost tradition of the birth of John the Baptist that took place in 12 bce at the time of Halley’s comet, suggesting a separate tradition of Jesus’ birth in 6 ce at the time of the ‘first census’.