It is important for the newcomer to know that most all references pertaining to Emission Theories, both on-line and in print, are regrettably completely out of date and are mostly edited by those who are unfamiliar with the profound fundamentals of emission theories; i.e., the correct application of Galilean transformations of velocities in Euclidean Space Geometry. 

As opposed to the Emission Theory of Walter Ritz's, the Extinction Shift Principle presented here is the correct treatment of the undisturbed nature of the measurement of a wave or a photon. It is straight forwardly seen that neither the velocity nor the wavelength of a primary undisturbed wave packet or a photon can be directly measured. A measurement of the velocity of a wave packet requires at least two positions, X1 and X2, and their corresponding instances in time, T1 and T2. Any measurement by physical means will introduce interference, extinguishing the undisturbed primary wave, replacing it with a re-emitted extinction shifted secondary wave, thus denying the physical observer all observations of the undisturbed nature of the primary wave. 

The book, Discourses & Mathematical Illustrations pertaining to the Extinction Shift Principle under Electrodynamics of Galilean Transformations presents the Principal Axioms of the Extinction Shift Principle applied to both gravitation and electromagnetism under electrodynamics of Galilean transformations of velocities. 

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Extinction Shift Principle©

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A FIRST IN EMISSION THEORIES