Cusp-a point of transition, as from one historical period to the next; the borders between the twelve astrological signs. You are considered to be "on the cusp" if you were born within a day or two of the beginning or end of any sign.
The Rocky Mountains, Lander's Peak, 1863; Albert Bierstadt
As he passed by the Sea of Galilee,
he saw Simon and his brother Andrew casting their nets into the sea;
they were fishermen.
Jesus said to them,
“Come after me, and I will make you fishers of men.”
Then they left their nets and followed him.