The astronomical kernel: solstitium means sun-standing-still, and around December 21 the sun's southward drift genuinely halts for a few days before reversing. Zeitgeist's additions fail: the sun travels the ecliptic, which never intersects Crux, the Southern Cross sits roughly 50 degrees off the sun's path; Ptolemy counted those stars inside Centaurus, and Crux as a distinct constellation dates to 1592. The three-day death-and-rise has no ancient astronomical source; it is the myth's math, not the sky's.
The story's power is the English echo: son dies on a cross, sun dies on the Cross, three days, then resurrection. In Koine there is no echo, and in the sky there is no crossing. What survives scrutiny is older and simpler: every northern culture noticed the sun stop, sink, and return, and built a festival at the turn. Saturnalia, Yule, Natalis Invicti, Christmas, the rebirth slot was crowded long before anyone needed a constellation.
The claim: the dying-sun myth proves narratives can achieve escape velocity from the astronomy that inspired them, the solstice pause seeded the story, and the story then accrued details, Crux, three days, that the sky never ratified, because myth optimizes for meaning, not accuracy. Verdict: the accretion is documented layer by layer. But the pause itself is the one unimpeachable fact in the file, and it is enough: once a year, the light really does stop, hesitate, and come back. Every myth that ever loved that fact is, at its root, an honest observation.
If the astronomy fails, why does the story keep eclipsing the rebuttal?