How does the compass show east longitude and north latitude?

The compass indicates the direction, and there is no other measuring tool. It is impossible to measure the latitude and longitude only by the compass.

"Guide" means guidance or guidelines, while "Guide" comes from "Sina", both of which are just a tone. In Han and Tang literature, readers can read such words as "Sina of things", "Sina of literature" and "Sina of people". After the Tang Dynasty, the word "Sina" in social science was completely replaced by "guide". After the Tang Dynasty, "Sina" (magnetic spoon) miraculously disappeared, because the magnetic needle had come out.

After the advent of the magnetic needle, it was used for navigation and navigation. In order to make it easy to use and read, the discovery of magnetic declination put forward higher requirements for the use skills of compass. Fang Jia first created a new generation of compass through the cooperation of magnetic needle and dial.

China's magnetic needle and compass spread to the west by land and water successively, which had a great influence on the process of human civilization. Historians believe that the water compass with a magnetic needle floating in the water comes down in one continuous line with the compass, which was invented by China. 1985 The dry compass held by the figurine "Zhang" unearthed from Zhu Jinan's tomb in Linchuan, Jiangxi Province in the Southern Song Dynasty proves that the invention right of the dry compass also belongs to China.

Compass is the result of China ancient working people's understanding of magnet magnetism in long-term practice. As one of four great inventions of ancient china, its invention has played an inestimable role in the development of human science, technology and civilization. In ancient China, the compass was first used for rituals, etiquette, military affairs and divination, and to determine the orientation when looking at geomantic omen.

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