Relativistic aberration formula

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The relativistic aberration formula was derived by Einstein in 1905.

\cos \theta_o=\frac{\cos \theta_s-\frac{v}{c}}{1-\frac{v}{c} \cos \theta_s} \,

where in the reference frame of the observer, the source is moving away with velocity v\, at an angle \theta_o\, relative to the direction from the observer to the source (at the time when the light is emitted)

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