At the turn of the twentieth century, Lorentz understood the futility of mechanical support to explain the propagation of the electromagnetic field. He also discovered the theory of electrons. Meanwhile, the mathematicians Gauss, Lobatchevski, Bolyai and Riemann created the concept of curved space and endeavored to define the peculiarities of coordinate systems relative to each …

In China, the greatest astronomer of the Middle Kingdom was Tcheou Kong, the brother of Emperor Wou Wang who lived in the eleventh century before our era. He built an observatory in the city of Honan-fu, determined the position of the solstices, discovered the latitude, and deduced the inclination of the axis of the Earth …