Scientists have researched whether or not the Star of Bethlehem was actually a Great Conjunction. Conjunctions of Jupiter with the bright star Regulus in the years 2 BC and 3 BC have been investigated in the context of the Gospel of Matthew and the Star of Bethlehem.
Looking through the mosquito netting on my backpacking tent in the night sky, I notice that bright stars have a “cross” appearance to them. The screen causes the star’s light to diffract (bend) around the screen’s material and causes diffraction spikes. You can also see diffraction spikes when looking at stars with your naked eye and squinting — the result of diffraction due to your eyelashes.
It is perfectly reasonable that historic viewers of the Great Conjunction saw diffraction spikes. Historical renditions of Star of Bethlehem depict the conjunction with what looks like diffraction spikes.
To demonstrate this effect, I include a photograph I took with a Bahtinov Mask which creates diffraction spikes to help photographers manually focus on distant stars.