No Gospel names a day, a month, or a season for Jesus's birth.
Imported citation, not independently checked: Canonical Gospels
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Why Is Christmas on December 25?
Why Is Christmas on December 25?
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The current answer
The Gospels give no date. Two theories compete, and the popular one (stolen from Sol Invictus and Mithras) is shakier than the internet thinks.
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Luke's detail of shepherds "keeping watch over their flock by night" (Luke 2:8) has been argued both toward spring and away from winter, but it fixes no date.
Imported citation, not independently checked: Luke 2:8
The earliest secure attestation of December 25 as Christ's birthday sits in the Chronograph of 354, an illustrated Roman almanac compiled by the calligrapher Furius Dionysius Philocalus.
Imported citation, not independently checked: Chronograph of 354
Early Christians held a notion of "integral age," the belief that a great prophet died on the same date he was conceived, living a whole number of years.
Imported citation, not independently checked: Sextus Julius Africanus, Chronographiai (c. 221)
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