" After the conversion of Europe to
Christianity, the feast day of St. John the Baptist was set
as JUN-24. It " is one of the oldest feasts, if not the
oldest feast, introduced into both the Greek and Latin
liturgies to honour a saint. " 8 Curiously, the feast is held on the alleged date of his birth. Other Christian saints'
days are observed on the anniversary of their death. The
Catholic Encyclopedia explains that St. John was " filled
with the Holy Ghost even from his mother's womb...
[thus his] birth...should be signalized as a day of
triumph." 8 His feast day is offset a few days after the
summer solstice, just as Christmas is fixed a few days
after the winter solstice. 9 " Just as John was the
forerunner to Jesus, midsummer forecasts the eventual
arrival of " the winter solstice circa DEC-21..."
http://www.religioustolerance.org/summer_solstice.htm