In spite of disagreement by some, Frances was adamant that Jesus was born on December 25, which was at winter solstice. (Today it is December 21.) Winter solstice marks the end of longer nights and the beginning of more daylight. For Jesus birth to be at winter solstice is symbolically perfect, for as the Old Testament prophets said,
"In the latter time he has made glorious the way of the sea, the land beyond the Jordan, Galilee of the nations. The people who walked in darkness have seen a great light; those who dwelt in a land of deep darkness, on them has light shone," Isaiah 9:1-2; and
"Arise, shine, for your light has come, and the glory of the LORD has risen upon you. For behold, darkness shall cover the earth, and thick darkness the peoples; but the LORD will arise upon you, and his glory will be seen upon you. And nations shall come to your light, and kings to the brightness of your rising," Isaiah 60:1-3.