How does the compass locate the geographical position?

The earth is a magnet, the geographical north pole is the south pole of the magnet, and the geographical south pole is the north pole of the magnet. The magnetic induction line of the magnetic field starts from the geographical south pole to the geographical north pole on the surface of the earth, but the opposite is true inside the earth. The small magnetic needle of the compass is influenced by the earth's magnetic field, so that the south pole of the small magnetic needle points to the geographical south pole of the earth. Just write "South" on the south pole of the small magnetic needle to indicate the direction.

Compass, which was called compass, compass, warp disk, compass disk, meridian disk, needle disk and geomantic compass in ancient China, was an indispensable and important tool for ancient geomancers to engage in comparable activities. Compass disk has many levels, complicated contents, profound principles, white five lines of gossip, branches and branches, solar terms, astronomical calendars, and the division of states and countries. As the preface of Interpretation of Compass says: "Compass, with its implication of heaven and earth, dials the degree of stars, observes the flow of mountains and rivers, responds to the air with shape, and is reasonable in number, all of which are densely covered, while both houses of Yin and Yang are Ye Ji, so it is called Compass because of its complexity and mystery."

a few years ago, the study of geomantic omen began, but the in-depth research results involving compasses were scarce. There may be three reasons for this: first, the mind has concerns and thinks that it should not be studied or inappropriate; Second, it is really difficult to study the mystery of compass in depth; Third, there are research results but they don't want to be made public. So it is difficult for people to know its true face.