Article in English: At noon, the sun can point you in the general direction of north and south, and consequently east and west, but it will not tell you due north or due south. In the Northern Hemisphere, walking directly toward the sun at noon will lead you south, while walking directly away from the sun will lead you north. In the Southern Hemisphere, the opposite is true: toward the sun will lead you north, and away from the sun will lead you south. The sun rises in the general direction of east and sets in the general direction of west every day, so you can use the location of sunrise or sunset to get an approximate idea of direction. Face the sunrise and you are facing east; north will be on your left and south will be on your right. Face the sunset and you are facing west; north will be on your right and south will be on your left. The location of sunrise and sunset only provide an approximate idea of direction 363 days of the year, because the sun rises due east and sets due west only on the vernal and autumnal equinoxes (the first day of spring and fall). While using vegetation to determine direction isn’t an exact science or a precise method, oftentimes it can give you a basic idea of which direction’s which. Living north of the equator, the sun is usually in the southern part of the sky, and the opposite is true south of the equator. This means that leaves and foliage will tend to be thicker and denser on the southern side of a tree or bush. The opposite is true in the Southern Hemisphere, where vegetation will be more lush on the northern side. Many guidebooks will note that moss only grows on the north side of a tree in the Northern Hemisphere, but this is not true. However, while moss can grow on all sides of a tree, it is true that it will often be denser on the side that is shadier (the north in the Northern Hemisphere and the south in the Southern Hemisphere). The sun can be used in conjunction with a non-digital wristwatch to provide an approximate idea of the cardinal directions if you find yourself lost in the...

Summary in Vietnamese:
Quan sát mặt trời vào buổi trưa. Dùng hướng mặt trời mọc và lặn để xác định phương hướng tương đối. Quan sát thực vật. Tính toán phương hướng bằng đồng hồ có kim chỉ giờ và mặt trời.