A NASA astronomer has put forward what he calls the first scientifically grounded explanation for the Star of Bethlehem, the guiding light that led the Three Wise Men to Jesus’ birthplace over two millennia ago.
Mark Matney’s study, published in the Journal of the British Astronomical Association, identifies a celestial object observed by Chinese court astronomers in 5 BCE as the same phenomenon that illuminated the location of the infant Jesus.
Ancient Chinese records, kept for astrological purposes, describe a brilliant comet that remained visible for more than 70 days starting in the spring of that year.
In the Gospel of Matthew, the star is said to appear in the east, then move ahead of the Magi on their journey from Jerusalem to Bethlehem, eventually “standing over” the place where the child could be found.
Context and dating put the Nativity between 6 BCE and 5 BCE, since King Herod is believed to have died no earlier than late 5 BCE.
Matney employed an innovative method to recreate how this comet would have appeared from ground level as it moved across the sky. By testing orbital paths that fit the Chinese observations, he found routes that brought the object close enough to Earth that its eastward drift would effectively counteract Earth’s rotation for several hours. Satellite engineers recognize this as a temporary geosynchronous motion.
From observers on the ground, the comet would appear to pause almost directly above before continuing on its path.
One orbital reconstruction suggests the event occurred on a June morning in 5 BCE, with the comet seeming to align with the Jerusalem–Bethlehem road as it rose in the sky.
Matney described the finding as the first astronomical candidate for the Star that could produce the apparent motion described in Matthew, where the Star seemingly went before the Magi and then stood over the child’s location.
For this effect to happen, the comet would have needed to pass unusually close to Earth—roughly 236,000 to 249,000 miles (about the same distance as the Moon).
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Matney also proposed that the star could have been a comet seen by Chinese astronomers around the same period.
He points to the 2014 close approach of the Siding Spring comet to Mars, which came within about 87,000 miles, as proof that near-Earth passages can occur.
“While rare, such close approaches are possible,” Matney wrote.
Under this scenario, the comet would have been extraordinarily bright and even visible in daylight, according to Matney. His calculations place the Wise Men observing it during mid-morning hours, with the Magi traveling southward and the comet appearing distinctly in the southern sky, climbing higher as they progressed.
A comet visible for months fits the Gospel’s description of a prolonged observation of the Star. In the ancient world, comets carried significant symbolic weight in Greco-Roman and Eastern astrology, often signaling royal births, shifting power, or divine intervention. For a group of elite astrologers, such a striking celestial event would be a powerful incentive to embark on a journey.
The question of what exactly caused the Star of Bethlehem has been debated for centuries. Matney’s theory joins a long line of attempts, with roughly 400 scholarly investigations over time. Earlier candidates include Johannes Kepler’s suggestion of a Jupiter–Saturn conjunction in 7 BCE, and theories proposing a supernova or a miraculous, non-natural event.
Meanwhile, many researchers and believers view the Star of Bethlehem as either a miraculous occurrence or a symbolic narrative rather than a calculable astronomical phenomenon.
