Abstract
Because the solar system is orbiting around the center of the Milky Way galaxy with a speed of about 220 km/s, I showed, in a previous paper (M. Mizushima: J. Phys. Soc. Jpn. 61 (1992)1125), that g x x - g y y = g x x - g z z =10 -12 , where g i j is the metric for an observer moving with the solar system, and the x -axis is in the direction of the orbiting velocity of the solar system, namely, in the direction of constellation Cygnus. To detect any anisotropy of space, Brillet and Hall placed an interferometer on a turntable which rotated in a horizontal plane, and they tried to detect any change in size of a cavity optically. They could detect fractional change of the cavity size to 0.5×10 -14 , but they did not find any anisotropy of space (A. Brillet and J. L. Hall: Phys. Rev. Lett. 42 (1979) 549). It is shown here that the reason why they did not observe anisotropy of space was that they mounted the interferometer cavity too rigidly on the turntable.
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