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.
