On this day 453 years ago, on December 11, 1572 (November 7, 1572 lunar calendar), the Danish astronomer Tycho discovered a nova in the constellation of Sendai. On December 1, 1572, the Danish astronomer Tycho discovered a nova in the constellation of Sendai. He wrote a paper on the topic "Nova" and published it. This paper was better than a giant bomb, and it shook the Aristotelian theory of celestial immutability that had been held in doubt. Tycho Brahe Tycho Brahe (1546-1601), a Danish astronomer. He was born on December 14, 1546 in Knuzstup, Denmark, to an aristocratic family. Since childhood, he liked to observe the stars. In 1559, he entered the University of Copenhagen to study law. In 1562 he entered the University of Leiptian. In August 1563 he made the first astronomical record - Jupiter conjunct Saturn. After 1565, he traveled to many parts of Europe to study. On November 11, 1572 he discovered a nova in the constellation Cassiopeia. After long-term observations, he thought it was a very distant star (now known as a supernova in the Milky Way). In 1576, with the support of King Frederick II of Denmark, he established a grand observatory on the island of Veng. In 1600, he invited Kepler to be his assistant. Tycho died on October 24, 1601. In his last days, he gave Kepler the observations he had accumulated during his life. Tycho proposed a cosmic system between Ptolemy's geocentric system and Copernicus's heliocentric system. He believed that the earth was at the center of the universe, stationary, the planets revolved around the sun, and the sun led the planets around the earth. Tycho was an outstanding astronomical instrument maker, having built many large and sophisticated astronomical instruments. The popularity of equatorial devices in Europe was inseparable from his work. His years of painstaking observations prepared the basis for Kepler's discovery of the three laws of planetary motion. Comments: Astronomer who installed a famous golden nose