A closer analysis of the mathematical expressions for the description of linear and revolutionary motions reveals that the characteristics of these two motions are interconvertible under appropriate condition. Here, it is proposed that revolutionary motion is the only type of motion that exists in the universe and rectilinear motion is a special case of it. In case of propagation of light, this proposal fails in the terrestrial experiments but at astronomical distances the revolutionary motion of light was reported as experimental observations. Einstein considered the propagation of light rays in straight lines and in his general theory of relativity he proposed the bending of light rays as the effect of gravitational field of the Sun. According to him, force of gravity arises from the curvature of space-time. He tried to place gravitational force in line with electrical and magnetic interactions obeying Newton’s description of universal gravitation. This might be the leading cause that Einstein was not successful in interpreting the gravitation as well as the unified field theory.