In view of recent rapid advances in technology, one may be surprised to learn that at least two of the basic tenets of optics are over a thousand years old, namely the law of reflection and the law of reciprocity. This book serves to update existing knowledge about light with the help of new actual data derived from easily reproducible experiments. They form the basis of a new theory which interprets up-to-date, verifiable information according to the various speeds of the lights involved. Since light is in Space and requires Time for its Motion these terms are defined as the basis of the new observations detailed in the book. The second chapter furnishes a brief historical background, which is followed by chapters on optokinetics, dealing with the actual new laboratory data, and optokinematics, examining light’s general motions in space.