Compass is a special tool used by Feng Shui experts to judge time and space. It contains rich scientific knowledge. As the saying goes, "one mountain, two waters and three directions". Only with the three groups of judgments of mountain, water and orientation can we make a comprehensive analysis and evaluation of Feng Shui. Its straight needle position is used to determine the direction of meridians, the middle needle plate is used to remove and divert sand, and the sewing needle plate is used to receive water, that is, to determine the good or bad direction of water coming and going.
There are twelve heavenly stems, twenty-four mountain directions, eight diagrams, and twenty-eight stars on the compass. The function of compass is to judge the direction. It was invented by China people in the 9th century.
Time judgment has "eight characters" year, month, day and time. According to these eight-character signs, we can further judge whether it is good or bad.
In the eyes of the ancients, "a compass is all-encompassing, and it is also a latitude and longitude." It is said that he can reach the sky because there are 24 solar terms and 28 stars on the compass. Since the beginning of winter, the sun has circled fights, cows, women, emptiness, danger, houses, walls, buildings, stomachs, ang, bi, Gou, Shen, wells, ghosts, willows, stars, Zhang and Yi.
It can be said that it can "latitude" because the compass has 12 branches of eight diagrams and nine palaces, which can represent eight directions of the country and Kyushu, and eight diagrams can also represent eight natural things: heaven, ze, earth, fire, wind, thunder, mountains and water. Twelve branches represent many things. Compass is similar to the Book of Changes, the Book of Songs, the Book of Filial Piety and so on. In short, the images in the sky and the images in the ground are all subordinate, which is the so-called "cross-sky and cross-latitude".