This study looks the field of inhomogeneities of time coordinates. Equations of motion, expressed through the field tensor, show that particles move along time lines because of rotation of the space itself. Maxwell-like equations of the field display its sources, which are derived from gravitation, rotations, and inhomogeneity of the space. Energy-momentum tensor of the field sets up that it is an inhomogeneous viscous media, which is in the state of ultrarelativistic gas. Waves of the field are transverse, the wave pressure is derived from mainly sub-atom processes - exciting/relaxing atoms produce the positive/negative wave pressure, that lead to testing the whole theory.