Lent, Advent, Ordinary Time, and Easter.
Violet,Red,Blackand rose are the four colours associated with different sources of the church
Spring, Summer, Autumn and Winter are the four seasons that make up Vivaldi's four seasons.
Baptists do not follow a strict liturgical year. They do have Christmas ,Easter, and so forth. They do not follow saints' days and a long 40 day lent like many other churches.
When the weather changes because of NATURE!