What Is Relativity in Physics?

dcarmichael
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Homework Statement
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 ?
Relevant Equations
n/a
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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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