6
　3.2  Difference in calculation
　According to this paper, with respect to the location of the MGP experiment, the relative motion of each parts of geological layer moving with the earth’s rotation is applied as gravitational field movement speed at the ground surface on which the experiment was conducted.
　Since the total value obtained from the equation (2.2.3) is the integrated value over the entire earth, the calculation of simply ω=ω0sinθ, based on the experimental location (latitude θ) and earth’s rotational speed ω0, should result in a slight difference.
　Furthermore, we surmise that the officially accepted value of light speed based on Michelson’s measurements should have been different depending on the locations of Moon, Venus, and Mars with respect to the earth at the time of measurement.


　3.3  The velocity of light in space
　For example, it is known that, to keep an object on the earth’s orbit of revolution around the sun and keep it from falling into the sun, it is sufficient to keep the object’s tangential speed around 30 km/sec just like the earth. A space which is far away from the earth and satisfies this condition can be considered an inertial frame as defined in the conventional theory. According to the conventional theory, with respect to this coordinate, the speeds of light traveling in the direction of the revolution and that travelling opposite to it are the same.
　However, based on the characteristics of light introduced in this paper, the measuring device for light speed is travelling at 30 km/sec with respect to the sun’s gravitational field, which should be the rest frame for light. Therefore, it can be predicted that there would be a difference (relative speed) of about 30 km/sec between the each light speeds and c. We expect that an experiment will be performed in space to be clarified which is true of them.


4.  Conclusion
　Now it will be summarized as follows:
Light transmits at light speed c, through a magnetic field at the microscopic level and a gravitational field at the macroscopic level. That are


Law of light velocity

　Law 1: Gravitational law for the speed of light
　
　The gravitational field is the background for light, and light travels at c with respect to this background.
　The value to c depends on the strength of the gravitational field and, therefore, is not constant.


　Law 2: Law of gravitational field distribution

　The background velocity of light in a given space is the sum of vectors of velocities of objects creating the gravitational field normalized by their ratios of Newton's law of universal gravitation.
　The background velocity does not exceed that of the fastest moving object.


　Also, the speed of gravitational field can be obtained from Law 2, as follow.
　　　　　
　The frame with this velocity is the rest frame of light.