What does the phenomenon of the moon "the new moon embraces the old moon" mean?

If the moon is stationary, we should see the moon rise and set at the same time every day because of the rotation of the earth. But (the moon revolves around the earth, and the direction of revolution is the same as that of the earth's rotation-from west to east. In this way, after the earth rotates once, the moon moves forward a certain distance in its orbit. The earth must turn forward and catch up with the moon before we can see it. So the moon always rises a little later than the day before, about 5 days later every day on average.

Have you carefully observed the waning moon? If you look closely, you will find that the moon is not completely black except for the illuminated crescent, but emits a gray-yellow shimmer, as if the crescent embraced a faint "gray light." People call this phenomenon "the new moon embraces the old moon".

What's going on here? It turns out that not only the moon can reflect sunlight to illuminate the earth, but also the earth can reflect sunlight to illuminate the moon. Gray light means that the earth reflects sunlight to the surface of the moon and then back to the ground. The color of gray light will also change: when the vast ocean part of the earth faces the moon, the gray light is light blue; When the continental part of the earth faces the moon, the gray light turns pale yellow.

The moon. Around the earth, there is also rotation. As mentioned earlier, the moon always looks at our factory with its "smiling face", which is the proof of the moon's rotation. Because the time of the moon's rotation is exactly the same as that of its revolution around the earth. If the moon does not rotate, or the rotation period is different from that of period of revolution, then we can see the full moon. Because the moon will shake a little when it rotates along the orbit, 465,438+0% of the moon's surface always faces the earth, 465,438+0% always faces away from the earth, and 65,438+08% is sometimes visible and sometimes invisible.