Something that can point the way.

1. compass: The compass, also called Sina, is mainly composed of magnetic needles installed on the shaft. Under the action of natural geomagnetic field, the magnetic needle can rotate freely and keep in the tangential direction of magnetic meridian. The north pole of the magnetic needle points to the geographical north pole, and the direction can be distinguished by using this property. Compass is the result of China ancient working people's understanding of the magnetism of objects 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 Feng Shui.

2. Sun: The sun rises in the east and sets in the west, which is the most basic way to tell the direction. At noon, the position of the sun is the east; At noon, the position of the sun is in the west.

3. Polaris: Polaris is a very important indicator of field activities and the direction of ancient navigation, and it is also a constellation that can distinguish the direction from stargazing to astrophotography and accurate positioning by the equatorial observatory in the observation room. Because Polaris is closest to true north, people on earth have been navigating by its starlight for thousands of years.