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--- un:aberration [2023/05/30 01:25] – asad
+++ un:aberration [2023/07/09 01:09] (current) – asad
@@ Line 1: / Line 1: @@
 ====== Aberration ======
-Apparent motion of celestial objects with respect to a moving observer (Earth) dependent on the the observer's [[velocity]].
+{{:un:stellar-aberration.png?nolink|}}
 {{https://upload.wikimedia.org/wikipedia/commons/9/93/Simple_stellar_aberration_diagram.svg?nolink}}
@@ Line 16: / Line 17: @@
 $$ \tan(\theta-\phi) = \cot\phi = \frac{\gamma(v/c+\cos\theta)}{\sin\theta} = \frac{v}{c} $$
-and, finally, if $\theta-\phi$ is very small then $\theta-\phi \approx v/c$.
+and, finally, if $\theta-\phi$ is very small then **aberration** $\alpha = \theta-\phi \approx v/c$.