Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Luopan is a Chinese magnetic compass, also known as a Feng Shui compass. It is used by a Feng Shui consultant to determine the precise direction of a structure or other item. Since the invention of the compass for use in Feng Shui, traditional feng shui has required its use. Like a conventional compass, a luopan is a direction finder. However, a luopan differs from a compass in several important ways. The most obvious difference is the Feng Shui formulas embedded in concentric rings on the surface. This is a metal plate known as the heaven dial. The metal plate typically sits on a wooden base known as the earth plate. The heaven dial rotates freely on the earth plate. A red wire or thread that crosses the earth plate and heaven dial at 90-degree angles is the Heaven Center Cross Line, or Red Cross Grid Line. This line is used to find the direction and note position on the rings. The schematic of earth plate, heaven plate, and grid lines is part of the two cords and four hooks geometrical diagram in use since at least the Warring States period.
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