What Is Relativity in Physics?

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Relativity in physics describes how the laws of physics are the same for all observers, regardless of their relative motion. It emphasizes that time and space are interconnected, leading to the concept that time can vary depending on an observer's velocity. The discussion touches on the idea that the movement of stars illustrates these principles, as it takes time for a star to transition between two positions. Additionally, relativity challenges traditional notions of absolute time and space, highlighting the importance of the observer's frame of reference. Understanding relativity is crucial for grasping modern physics concepts.
dcarmichael
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The Principle of the astronomical measurements which indicate that the velocity of light is NOT constant relative to its source can be demonstrated by the following problem. Consider a pair of stars A,B of equal mass in circular orbit about their center of mass, C which is a distance d from earth. Assume that the orbit radius is r , the orbital velocity u and that the line of sight to earth is in the plane of orbit.
I understand where the 2nd term in part II comes from but where does πr/u come from ?
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It takes some time for star ##A## to get from position ##A_1## to position ##A_2##.
 
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