# Relativistic Aberration and Doppler Shift

Relativistic Aberration and Doppler Shift

Suppose a specific number of evenly distributed light rays is incident on an observer at rest. For a moving observer at the given location, with scaled velocity , these light rays appear to be tilted in the direction of motion (aberration), as indicated by the yellow triangle. As a result of the Doppler effect, light that comes from the direction of motion is blue-shifted, while light from the opposite direction is red-shifted.

β=v/c