A unified theory of gravity and electromagnetism has been developed, based on the hypothesis that electric, magnetic and gravitational fields are components of a single field called the graviton field. A formula describing the dynamics of the graviton field has been found and accepted as an axiom. Based on the graviton field formula, extended dynamic laws of gravitational, magnetic and electric fields for moving coordinates are derived, allowing relativistic effects to be taken into account within the framework of the developed theory. It is shown that Newton's law of universal gravitation, Coulomb's law, Maxwell's equations, and other known laws of electrodynamics follow from the equations of the developed theory as special cases for fixed coordinates
