The speed of light was calculated at roughly 300 million meters per second by way of having the light go to a mirror and come back, then dividing the time by two. It cannot be done without the mirror since difference in location may alter timing, and any corrections require the speed of light in the calculations. Thus, it has been suggested by Dr. Jason Lisle that the speed of light may not be 300 million meters per second in any direction, but rather instantaneous in one direction and 150 million meters per second in the other.<ref>http://www.creationwiki.org/Anisotropic_Synchrony_Convention</ref>
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The speed of light was calculated at roughly 300 million meters per second by way of having the light go to a mirror and come back, then dividing the time by two. It cannot be done without the mirror since difference in location may alter timing, and any corrections require the speed of light in the calculations. Thus, it has been suggested by Dr. Jason Lisle that the speed of light may not be 300 million meters per second in any direction, but rather instantaneous in one direction and 150 million meters per second in the other.<ref>http://www.creationwiki.org/Anisotropic_Synchrony_Convention Better source needed.</ref>