  One of two postulates that are base for special relativity is that the laws
of physics are invariant in all inertial systems, which has as a consequence
that it is impossible for an observer to detect his motion through space. It
will be shown that this is in a contradiction with the results of the
Hafele-Keating experiment, which established that time is going faster in an
airplane going westward than in that going eastward, if compared with clocks
located on Earth. The result of the experiment allows not only to conclude that
Earth is rotating toward east, but also to calculate the speed of Earth motion.
Performing similar experiments it is also possible to measure Earth speed
around the Sun, its speed in our galaxy, and actually its absolute speed. To
generalize this for any inertial frame and to explain why an absolute speed can
be assigned to any inertial frame we introduced the triplets paradox.
