221 years ago today, on September 1, 1804 (July 28, 1804 in the lunar calendar), German astronomer Carl Harding discovered the star Maryam. 3Juno is the third asteroid discovered by humans and one of the largest asteroids in the asteroid belt. It is an S-type asteroid composed of heavier rocky materials. It was discovered on September 1, 1804 by the German astronomer Karl? Harding discovered it with an ordinary 2-inch telescope and named it after Juno, the highest-ranking god of marriage in Roman mythology. Karl Ludwig Harding (September 29, 1765-August 31, 1834) was a German astronomer and discoverer of the star Maryam. In 1796, John Hieronymus Schr? ter) hired Harding as his son's tutor. In 1804, after Harding discovered Maryam at the Schroter Observatory, he went to Göttingen to become Gauss's assistant. In addition to Maryam, he also discovered three comets and published a catalog of 12,000 stars: "Atlas novuscoelestis". There is a crater on the moon named after him, and asteroid 2003 is also named Harding. Comment: Harding holds a high position in astronomy.