Main Article Content
In this paper, the nature of time is investigated on the basis of experiments with mechanical, sound and light clocks. The formula of the "law of time" reflects the physical essence of time. The relationship of time with the density of the physical medium and the interaction between its elements is shown. Revealed the link between gravity and time, based on the principles of similarity of physical processes. The change in time is shown, with linear compression of the rocket dimensions, at speeds close to the speed of light due to changes in the density of the medium.