The question of the structure of the Universe and the place of the planet Earth and human civilization in it has been of interest to scientists and philosophers since time immemorial. For a long time, the so-called Ptolemaic system, later called geocentric, was in use. According to her, it was the Earth that was the center of the universe, and other planets, the Moon, the Sun, stars and other celestial bodies made their way around it. However, by the Late Middle Ages, enough evidence had already accumulated that such an understanding of the Universe was not true.
For the first time, the idea that the Sun is the center of our Galaxy was expressed by the famous philosopher of the early Renaissance Nicholas of Cusa, but his work was more of an ideological nature and was not supported by any astronomical evidence.
The heliocentric system of the world as a holistic scientific worldview, supported by serious evidence, began itsformation in the 16th century, when the Polish scientist N. Copernicus published his work on the motion of the planets, including the Earth, around the Sun. The impetus for the creation of this theory was the scientist's long-term observations of the sky, as a result of which he came to the conclusion that it is simply impossible to explain the complex movements of the planets based on the geocentric model. The heliocentric system explained them by the fact that with increasing distance from the Sun, the speeds of the planets noticeably decrease. In this case, if the planet, when observed, is behind the Earth, it seems that it begins to move backward.
In fact, at this moment, this celestial body is simply at the maximum distance from the Sun, so its speed slows down. At the same time, it should be noted that the heliocentric system of the world of Copernicus had a number of significant shortcomings, borrowed from the Ptolemaic system. So, the Polish scientist believed that, unlike other planets, the Earth moves uniformly in its orbit. In addition, he argued that the center of the Universe is not so much the main celestial body as the center of the Earth's orbit, which does not completely coincide with the Sun.
All these inaccuracies were discovered and overcome by the German scientist I. Kepler. The heliocentric system seemed to him an indisputable truth, moreover, he believed that the time had come to calculate the scale of our planetary system.
After long and painstakingstudies in which the Danish scientist T. Brahe took an active part, Kepler concluded that, firstly, it is the Sun that represents the geometric center of the planetary system to which our Earth belongs. Secondly, the Earth, like other planets, moves unevenly. In addition, the trajectory of its movement is not a regular circle, but an ellipse, one of the focuses of which is occupied by the Sun.
Thirdly, the heliocentric system received from Kepler its mathematical justification: in his third law, the German scientist showed the dependence of the periods of revolution of planets on the length of their orbits.
The heliocentric system created the conditions for the further development of physics. It was during this period that I. Newton, relying on the work of Kepler, deduced two of the most important principles of his mechanics - inertia and relativity, which became the final chord in the creation of a new system of the universe.
