👉 Upsilonism is a philosophical concept in the philosophy of science and physics that refers to the idea that certain physical phenomena, such as gravity or the motion of celestial bodies, are influenced by the gravitational forces of other objects. This means that the motion of celestial bodies around the Earth depends on the motion of the Earth itself. The term "upsilonism" is often used in the context of astrophysics and astronomy to describe the idea that the gravitational forces between stars or galaxies can affect their motions