It is shown that the results of Zeeman's experiments with a glass bloc
k moving at speed v relative to the Earth's surface should also depend
on the Earth's speed V in the universe or with respect to a preferred
frame S-p. The results received did not confirm the participation of
speed V in those experiments. Therefore, these experiments also confir
m that the Earth's surface is the preferred frame for the (radial) vel
ocity of light. New experiments are proposed to test or rather reject
special relativity.