  A new derivation of the relativistic aberration formula for a plane-polarized
light wave is presented that does not require any use of the Lorentz
transformation. The method is based on a modification of the Huygens-Fresnel
principle to include the relativistic effects introduced by the relative motion
between the observer and the emitter. The derivation clearly shows that the
aberration formula is a direct consequence of the relative simultaneity.

Optics;Astrophysics;Classical Physics