dayspring
/ˈdeɪsprɪŋ/Definitions
1. noun
The time of year when day is longer than night; a season of growth and renewal.
“The dayspring of spring brought new life to the barren landscape.”
2. noun
A source of light or warmth, especially in the morning or at the beginning of a period of growth or development.
“The dayspring of her career was marked by a series of successful performances.”