Xi 'e people in Nanyang, Henan Province, a great astronomer, mathematician, inventor, geographer, cartographer, writer and scholar in the Eastern Han Dynasty, made indelible contributions to the development of astronomy, mechanical technology and seismology in China. Because of his outstanding contribution, the United Nations Astronomical Organization once named the asteroid 1802 in the solar system "Zhang Hengxing". Zhang Heng is one of the representatives of Huntian theory in the middle of Eastern Han Dynasty. He pointed out that the moon itself does not shine, and moonlight is actually a reflection of the sun's light; He also correctly explained the cause of the solar eclipse and realized the infinity of the universe and the relationship between the speed of planetary motion and the distance from the earth. Zhang Heng observed and recorded 2,500 stars, creating the world's first instrument for turning air leakage into sky, the first instrument for testing earthquakes-the seismograph for waiting for wind, and inventions such as the south guide car and the automatic recording drum car.
Xi 'e people in Nanyang, Henan Province, a great astronomer, mathematician, inventor, geographer, cartographer, writer and scholar in the Eastern Han Dynasty, made indelible contributions to the development of astronomy, mechanical technology and seismology in China. Because of his outstanding contribution, the United Nations Astronomical Organization once named the asteroid 1802 in the solar system "Zhang Hengxing". Zhang Heng is one of the representatives of Huntian theory in the middle of Eastern Han Dynasty. He pointed out that the moon itself does not shine, and moonlight is actually a reflection of the sun's light; He also correctly explained the cause of the solar eclipse and realized the infinity of the universe and the relationship between the speed of planetary motion and the distance from the earth. Zhang Heng observed and recorded 2,500 stars, creating the world's first instrument for turning air leakage into sky, the first instrument for testing earthquakes-the seismograph for waiting for wind, and inventions such as the south guide car and the automatic recording drum car.
Zu Chongzhi (Mathematics, Astronomy, Engineering)
People in the Southern and Northern Dynasties. Born in Yuanjia for six years, he died in Hou Yongyuan and Qi Hun for two years. My ancestral home is in Qixian County, Fanyang County. In order to escape the war, Zu Chongzhi's grandfather, Zuchang, moved from Hebei to Jiangnan. Zuchang was once a "great craftsman" in Liu Song, in charge of civil engineering; Zu Chongzhi's father is also a DPRK official. Zu Chongzhi received scientific knowledge from his family since childhood. When I was young, I entered Hualin University and engaged in academic activities. Throughout his life, he served as an official in South Xuzhou, such as Shangshu, Yamen joining the army, Lou county magistrate, servant shooting and Changshui captain. Its main contributions are in mathematics, astronomical calendar and machinery. For the first time in the history of mathematics in the world, the value of pi is calculated to six decimal places, that is, between 3. 14 15926 and 3. 14 15927. He proposed a contract rate of 22/7 and a secret rate of 355/ 1 13, which are the earliest in the world. He compiled his mathematical research results into a book called Composition. His Da Ming Li introduced precession into the calendar for the first time. It is suggested that 39 1 year set 144 leap month. The length of a tropical year is 365.338+04438+0 days, and the error is only about 50 seconds.
People in the Southern and Northern Dynasties. Born in Yuanjia for six years, he died in Hou Yongyuan and Qi Hun for two years. My ancestral home is in Qixian County, Fanyang County. In order to escape the war, Zu Chongzhi's grandfather, Zuchang, moved from Hebei to Jiangnan. Zuchang was once a "great craftsman" in Liu Song, in charge of civil engineering; Zu Chongzhi's father is also a DPRK official. Zu Chongzhi received scientific knowledge from his family since childhood. When I was young, I entered Hualin University and engaged in academic activities. Throughout his life, he served as an official in South Xuzhou, such as Shangshu, Yamen joining the army, Lou county magistrate, servant shooting and Changshui captain. Its main contributions are in mathematics, astronomical calendar and machinery. For the first time in the history of mathematics in the world, the value of pi is calculated to six decimal places, that is, between 3. 14 15926 and 3. 14 15927. He proposed a contract rate of 22/7 and a secret rate of 355/ 1 13, which are the earliest in the world. He compiled his mathematical research results into a book called Composition. His Da Ming Li introduced precession into the calendar for the first time. It is suggested that 39 1 year set 144 leap month. The length of a tropical year is 365.338+04438+0 days, and the error is only about 50 seconds.