The north side of the mountain is the shady side. Mountains to the south and water to the north are yang, mountains to the north and water to the south are yin.
The sun is in our south, so the sun shines from south to north. Since the mountains stand on the ground, when the sun shines on the mountains, it first shines on the south of the mountains. Since there is sunlight in the south, the south side of the mountains is sunny and the north is facing away from the sun, so there is no sunlight. , so it is yin; and the river is just the opposite, it is below the ground. < /p>
The rotation of the Earth also causes objects moving horizontally in any direction on the Earth to deviate from their original direction of motion. If the direction of movement of moving objects is used as the criterion, horizontal objects in the Northern Hemisphere will skew to the right, and in the Southern Hemisphere will skew to the left.
The reason for the deflection of the movement direction of horizontal objects on the earth's surface is that objects have inertia and strive to maintain their own speed and direction. As mentioned above, the horizontal directions on the earth are based on the longitude and latitude lines. The direction of the longitude lines is the north-south direction, and the direction of the latitude lines is the east-west direction.
However, due to the rotation of the earth, the longitude and latitude lines, which are the standards for the north-south and east-west directions, are deflected as the earth rotates. Therefore, the horizontal motion of an object that truly maintains a constant direction, if expressed by the direction on the earth, is relatively deflected.
Baidu Encyclopedia-Landscape Yin and Yang