Well, you have to assume that the orbit is stable, since life takes billions of years to evolve.

Probably two stars orbiting each other (or a common center of gravity) and the earthlike planet is like 95% in the Goldilocks zone, like some periods of tropical climate and some of icy conditions.

Or the system has one star like the sun in the center and another one far, far away, yet still orbiting.

Would be a mathematical nightmare to calculate