Abstract

For more than ninety years, many experiments have shown that the speed of light is not constant in the reference system connected to the Earth’s surface. But the speed of light (or of the electromagnetic radiation) is constant in the reference system connected with the space itself in homogeneous gravitational field (where the gravitational potential is the same). The speed of light in the reference system connected with the space itself is changing only when the light passes through time-spatial areas with different gravitational potentials (or through time-spatial areas with different levels of contraction/expansion of the space-time). The Galileo, Ulysses, Pioneer 10 and 11 acceleration anomalies are actually proving experiments of this reality. As a conclusion Uncertainty principle for the macro-world is proposed.