Here in the eastern United States, spring arrives later on this evening.
This means first of all that Easter is near, coming as it does (more or less) on the Sunday after the first full moon following the vernal equinox.
The vernal equinox also means it's time for the feast of the Annunciation--the conception of the Lord--when the Light begins to grow and the darkness starts to fade away. When the Light is reborn anew nine months later at the winter solstice, then it will be time for Christmas.
Exactly opposite Christmas in the liturgical calendar is the nativity of John the Baptist, arriving at the summer solstice, when the light begins to give way to the night. As John said, "he must increase and I must decrease."
Oddly enough, even though it's a big deal in Luke, the conception of John the Baptist doesn't show up as a feast day in what would be its place, around the autumnal equinox. Was this ever a feast day? Or is it in other calendars? Maybe somebody knows. Not that there aren't feast days around the fall equinox: St. Matthew, the Exaltation of the Cross, and, of course, the Stigmata of Francis.