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A laser diffraction experiment was conducted to study light propagation in air. The experiment is easy to reproduce and it is based on simple optical principles. Two optical sensors (segmented photo-diodes) are used for measuring the position of diffracted light spots with a precision better than 0.1 ?m. The goal is to look for signals of anisotropic light propagation as function of the laser beam alignment to the Earth?s motion (solar barycenter motion) obtained by COBE. Two raster search techniques have been used. First, a fixed laser beam in the laboratory frame that scans due to Earth?s rotation. Second, an active rotation of the laser beam on a turntable system. The results obtained with both methods show that the course of the light rays are affected by the motion of the Earth, and a predominant quantity of first order with a
c/c = − (1+2a) cos  signature with a = −0.4106?0.0225 describes well the experimental results. This result differs in a amount of 18% from the Special Relativity Theory prediction and that supplies the value of a = −1/2 (isotropy).

We report results on an ?one-way light path? laser diffraction experiment as a function of the laser beam alignment relative to the Earth?s velocity vector obtained by COBE measurements of the Doppler shift in the cosmic microwave background radiation (CMBR). An amplified Doppler shift is observed in the diffraction images, and the effect is compatible with a ?dipole? speed of light anisotropy due to Earth?s motion relative to the ?CMBR rest frame?, with an amplitude of c/?c = 0.00123. This amplitude coincides with the value of the dipole temperature anisotropy T/ ? T = 0.00123 of the CMBR obtained by COBE. Our results point out that it is not possible to neglect the preferred frame imposed by the cosmology and they are well described by the Ether Gauge Theory (an extension of the Lorentz?s ether theory) and it satisfies the cosmological time boundary condition.