301 years ago today, on April 22, 1724 (March 29, 1724 in the lunar calendar), the German philosopher Kant was born. Kant (1724-1804) was a German philosopher and founder of German classical idealist philosophy. Born on April 22, 1724 in Konigsberg, East Prussia, to a family of saddlemakers. In 1740, he entered the School of Philosophy at the University of Konigsberg and worked as a tutor for several years after graduation. He received a doctorate in philosophy in 1755 and later served as a lecturer and professor at his alma mater. Dean and principal positions. The "General History of Nature and Celestial Body Theory" and "Overview of the History of the Development of the Universe" published in 1755 put forward the nebula hypothesis on the origin of the sun, regarded the formation of the solar system as a process in which matter moves and develops according to its objective laws, and demonstrated that the natural world is constantly changing. The dialectical thought of development has played a revolutionary role in the history of philosophy. In terms of social and political views, he was deeply influenced by Lu Jun of France and advocated democracy, freedom, and equality. Think of the freedom envisaged. An equal republic is the "ideal heaven". It is just a pure ideal that cannot be reached and can only be realized on the distant side. He is also committed to the study of philosophical and social theoretical issues.