There were no clocks in ancient times. How did the people keep time?

How to measure distance without theodolite?

How to draw a map? Without satellite navigation, what should I do if I get lost when I travel? This series of mysteries plagued future generations. At the "Ancient Chinese Navigation Exhibition" recently exhibited in Dunhuang, Gansu, various ancient "black technologies" gave the answer: The ancient Chinese invented the compass, developed the "stretching technique" for astronomical direction finding and navigation, created the amazing timekeeping and astronomical instrument "Water Conveyor Observatory", and summarized the maps of "drawing six bodies" and "planning plan". The drawing method has made an important contribution to the development of world navigation technology, and promoted the economic and cultural exchanges of various countries in the world and the development of human progress.

  With the theme of "From Compass to Beidou", this exhibition is divided into "Time Service-Qin Ruo Hao Tian, ​​Respect to Give People Time", "Navigation-Magnet Sinan, and Crossing the Ocean with Stars" through text panels and physical exhibits. ", "Surveying and Mapping—Planning and Planning, Recognizing the Four Seas", "Communication—One Belt, One Road, People-to-People", and “Beidou—Serving the World and Benefiting Mankind” in five parts.

(Reporter Feng Zhijun produced Lu Huiqian)

Editor in charge: [Li Ji]

Keywords: times, technologies, ancients, series, generations, compass, people, distance, theodolite, map, video, chinanews, satellite navigation, clocks, mysteries