Found this fascinating stuff
Though the summer solstice has not played a major role in the history of Christianity or Judaism, unaware to most, several summer solstice traditions have been passed down through the millennia. The most notable in Christianity, which occurs during the summer and winter solstices, are the births of John the Baptist and Jesus of Nazareth. According to tradition, John the Baptist’s birthday occurs on June 24th, which is the point when the sun visibly begins descent from its pinnacle during the summer solstice.