Two-Sisters

Riddle: There are two sisters. One gives birth to the other. And the other, in turn, gives birth to the first. Who are they?

Answer: Night and Day

Source: https://www.riddles.com/8794

There are two sisters. One gives birth to the other. And the other, in turn, gives birth to the first. Who are they? — Two-Sisters by Riddler 24895 v1.

Riddle: There are two sisters. One gives birth to the other. And the other, in turn, gives birth to the first. Who are they? Answer: Night and Day — by Riddler 24895 v2.