What scientific and technological achievements did our ancestors have?

In addition to the four world-recognized inventions, there were many scientific and technological achievements in ancient China. 1 is the lunar calendar. Since the Spring and Autumn Period, the ancients in China have known about 24 solar terms, which is earlier than that in the West 1 thousand years. Up to now, the whole world is using the lunar calendar for agricultural guidance. 2 is Zu Chongzhi's Pi; 3. radius of the earth measurement and solar angle measurement of monks and their party; 4 is the invention of stirrup; 5 is alchemy; 6 is smelting; 7 is textile and printing and dyeing technology; 8 is a seismograph; 9 is a military crossbow and wooden cow; 10 is the river regulation engineering technology. The Baiqu and Dujiangyan projects shocked the world, especially the Three Gorges Project still adopts the technology of raising the water surface to cross the boat; 1 1 is a building engineering technology, and the greatness of the Great Wall and Epang Palace cannot be learned casually; 12 is a shipbuilding and navigation technology, but unfortunately it is not recognized by foreign robbers; 13 is a long-distance transportation technology, such as transporting grain thousands of miles and transporting corpses thousands of miles, which has not been correctly interpreted so far; 14 is a coffin preservation technology, which is incomparable so far; 15 is a ceramic firing technology, which can't be surpassed so far, especially Jun porcelain and Ru kiln. 16 is a theory of yin and yang, which is still controversial.

Too many. It will take several days to list them one by one.