Which of these factors does not cause seasonal change according to Newton's Law of Gravity?

Understand Newton's Law of Gravity, which states that every mass attracts every other mass with a force that is proportional to the product of their masses and inversely proportional to the square of the distance between their centers. This is expressed as: $F=\frac{GmM}{r^2}$, where $F$ is the gravitational force, $G$ is the gravitational constant, $m$ and $M$ are the masses, and $r$ is the distance between the centers of the two masses.