What are Yin and Yang in the Book of Changes?

deficiency of yang

Explanation: Yin represents reality and imagines the earth; Yang stands for emptiness. Imagine the sky.

Eight natural phenomena:

Dry for the sky: three yang, representing endless emptiness. The earth exists in the universe.

Kun is the land: three yin, representing thick soil. Humans live on the earth.

The ridge is water: in the middle is an imaginary sun, which is the moon next to the earth. The moon reflects the sun's light, so it can't shine by itself. It is empty.

Separation is fire: the solid yin in the middle is the sun in the universe. Indeed, the sun shines and heats by burning itself.

Earthquake is thunder: the virtual yang sinks and the real yin rises, which means that clouds with positive and negative charges contact to release energy and produce lightning.

Xun Wei-feng: the real yin sinks and the imaginary yang rises, indicating that the contact between positive and negative charges is completed and the energy spreads in the form of field.

Roots are mountains: under a virtual yang, there are two real yin, representing mountains and land.

Changing colors: Under a solid shade, there are two virtual yang, representing the ocean and the river.