This book discusses in detail the special theory of relativity without
including all the instruments of theoretical physics, enabling readers
who are not budding theoretical physicists to develop competence in the
field. An arbitrary but fixed inertial system is chosen, where the known
velocity of light is measured. With respect to this system a moving
clock loses time and a moving length contracts. The book then presents a
definition of simultaneity for the other inertial frames without using
the velocity of light. To do so it employs the known reciprocity
principle, which in this context serves to provide a definition of
simultaneity in the other inertial frames. As a consequence, the Lorentz
transformation is deduced and the universal constancy of light is
established. With the help of a lattice model of the special theory of
relativity the book provides a deeper understanding of the relativistic
effects. Further, it discusses the key STR experiments and formulates
and solves 54 problems in detail.