Zu Chongzhi can tell fortune _ how long has Zu Chongzhi counted?
1, story
circumference ratio
Before the pre-Qin and Han dynasties, people took the ancient rate of "straight diameter three times a week" as pi, which meant that the circumference of a circle was three times the diameter. Later, it was found that the ancient speed error was too big, which should be a little more than three times, but no one could tell exactly how much. Until the Three Kingdoms period, a man named Liu Hui put forward a scientific method to calculate pi-"secant method". He approximated the circumference of a circle with the circumference of an inscribed regular polygon. When the circle is inscribed with 96 polygons, π is approximately equal to 3. 14, and it is pointed out that the more sides inscribed in a regular polygon, the more accurate the π value is. On the basis of previous studies, Zu Chongzhi finally found that π was between 3. 14 15926 and 3. 14 15927. According to the social situation at that time, the accuracy of π has reached 7 decimal places, which can be said to basically meet the scientific and technological requirements at that time.
2. Profile of people
Zu Chongzhi (April 20, 429-500), Han nationality, was born in Wen Yuan. He was an outstanding mathematician and scientist in the Southern and Northern Dynasties. Born in Yuanjia and Liu for six years, he died in Hou Yongyuan and was in a coma for two years. Grandpa Zuchang was once a "great craftsman" in Liu Song, in charge of civil engineering;
Zu Chongzhi's father is also a DPRK official. Influenced by the family environment, Zu Chongzhi learned the scientific knowledge handed down from his family. When I was young, I entered Hualin University and engaged in academic activities. Throughout his life, he served as an official in South Xuzhou (now Zhenjiang), such as Shi, Fu joined the army, Lou Junling (now northeast of Kunshan), Servant Shooter and Changshui Captain. His main contributions are in mathematics, pi, astronomical calendar and machinery. He has made outstanding contributions to the progress of China and even the world civilization.
3. Personality assessment
Mathematician Zu Chongzhi's brilliant achievements in astronomy, calendar, mathematics and mechanical manufacturing fully show the high development of ancient science in China and the advanced civilization in China.
It is no accident that Zu Chongzhi has made such brilliant achievements. First of all, social production developed gradually at that time, which required certain scientific achievements to keep pace with it, thus promoting scientific progress. At this time, Zu Chongzhi made achievements in astronomy, mathematics and instrument manufacturing. Secondly, from ancient times to the present, in the long period of thousands of years, many scientific achievements have been accumulated, and Zu Chongzhi made achievements on the basis of what his predecessors created. As for Zu Chongzhi's personal earnest study, assiduous study, not superstitious about the ancients, not afraid of conservative forces, not afraid of struggle, not avoiding difficulties, naturally, is also an important reason for his outstanding achievements.