How to tell the north-south direction of leaves?

You can use natural phenomena and things around you to identify the direction, for example:

1, use the sun to identify the direction. The sun rises in the east and sets in the west, which is the most basic way to tell the direction. 2. Use Polaris to tell the direction. Polaris is located in the sky due north. When observed, its height from the ground is approximately equivalent to the local latitude. When looking for it, it is usually determined according to the Big Dipper or Hou Xian constellation. 3. Independent trees usually have lush branches and leaves in the south, smooth bark, sparse branches in the north and rough bark. The south is usually dense with grass, while the north is wet and covered with moss. 4. The rivers in China generally flow from west to east, and the direction can generally be determined. 5. The grass is dense on the northern edge of the glade. The annual rings on the cross section of the stump are generally separated in the south and smaller in the north.

Extended data:

The width of tree rings can help us understand the experience of trees and the relationship between trees and the local environment and climate at that time. Under favorable climatic conditions, trees grow well, xylem increases more, annual rings are wider, and vice versa. For example, the initial rings of trees are generally wide, indicating that the trees at that time were young and vigorous; Sometimes, after a tree has many narrow rings, it suddenly appears wide rings, which shows that the environment and climate are suitable for the growth of the tree in those years when the rings are wide. The eccentric tree wheel shows that the environment on both sides of the tree is different. Usually the southern side of the northern hemisphere is warmer than the northern side, so the southern side has wider tree rings.