3200 years ago, China was in the period of Yan Huang.
Before 2050, China Xia Dynasty was established.
1200 years ago, China used silk for weaving.
1200 years ago, the bronze (copper-tin alloy) smelting and casting technology of China Yinshang had reached a mature stage.
1066-22 1 years ago, China Zhou dynasty.
770- 476 BC, Spring and Autumn Period in China.
China knew how to cast iron 770 years ago.
In 722 BC, China began to record this day with dry branches.
700 years ago, Guan Zhong (725-645 BC) recorded magnets.
Before 6 1 1 year, there was the earliest comet record in China, which was later named Halley's comet.
In the 5th century, China's "Zhou Li" recorded the method of taking fire from the sun with metal concave mirror.
Pre-475- pre-22 1, Warring States Period.
400 years ago, pinhole imaging was discovered in Mo Zhai (468-376 BC).
350 years ago, China's Gander and Shi Shen compiled the world's earliest catalog.
250 years ago, in China's book Han Feizi at the end of the Warring States Period, there was a record of "Sina" distinguishing the north from the south.
Qian 22 1- Qian 206, Qin.
206 BC-220 AD, Han Dynasty.
In the 2nd century before, Huai Nan Zi written by Liu An (179- 122) recorded that ice was used as a lens and a mirror was used as a periscope.
Before the 2nd century, silk and hemp fiber paper were used in the Western Han Dynasty in China.
In 1 century, China recorded the tip discharge in Hanshu.
105 China made paper in Cai Lun during the Eastern Han Dynasty.
/kloc-in 0/32, during the Eastern Han Dynasty in China, Zhang Heng invented the world's first seismograph to measure earthquakes.
220-58 1 year, Three Kingdoms, Southern and Northern Dynasties.
At the beginning of the 3rd century, Hua Tuo, an anesthetic used in surgery, was invented in China at the end of the Han Dynasty.
In the 3rd century A.D., Liu Hui of Wei and Jin Dynasties in China proposed the method of secant circle, and the pi was 3. 14 16.
In the 5th century A.D., Zu Chongzhi (429-500) in China's Southern and Northern Dynasties calculated the value of pi to the seventh place after the decimal point, more than 1000 years earlier than westerners.
58 1-6 18, Sui Dynasty.
In the 7th century A.D., China adopted rigid printing in the Tang Dynasty.
In 725, China Nangong said that people measured the length of meridian.
In the 9th century, an alchemist of the Tang Dynasty in China invented gunpowder.
960- 1279, Song Dynasty.
In 1 1 century, Shen Kuo of the Song Dynasty in China wrote a book on Meng Xi.
104 1 year, China and Bi Sheng invented movable type printing, which was 400 years earlier than the west, and laid the foundation of modern printing.
1054, China recorded a supernova explosion in the history of Song Dynasty, which is the earliest written record of supernova explosion in the world. The remnants of supernovae formed the crab nebula we see now.
123 1 year, people in the song dynasty in China invented "thunderbolt", which was filled with gunpowder and could be thrown with a thrower. It is the embryonic form of artillery.
1259, when China fought against the nomads from the Southern Song Dynasty, it used a firearm that fired bullets from a bamboo tube, which was the prototype of the musket.
1279- 1368, Yuan Dynasty.
/kloc-In the first half of the 4th century, China began to use abacus.
1368- 1644, Ming dynasty.
1385, China established an observatory in Nanjing, which is the earliest fully equipped observatory in the world.
1596, Compendium of Materia Medica was published by Li Shizhen of Ming Dynasty in China. There are 1892 kinds of drugs in the book, which is an important scientific classic.
1637, China completed "Heavenly Creations" in Ming Dynasty and Song Dynasty, and summarized the industrial and agricultural production technology in China.
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