Since time immemorial, the cloudy cloud of the moon is a familiar natural picture, and the cycle of the moon is never broken. Many people have seen the changes in the moon since they were young, but they still don't know the rationale for it, or even assume that the moon will grow smaller and light itself. In fact, moon change is a simple phenomenon of celestial motion, and reading the principles allows you to understand romantic changes in the night sky。
First of all, it needs to be made clear that the moon itself does not have the ability to glow, and that the light of the moon that we see at night is a reflection of the sun on its surface. The moon is the natural satellite of the earth, which has always revolved around the earth, while the earth rotates around the sun, and the positions of the sun, the earth and the moon are constantly changing as they turn。
The sun shines on one side of the moon, while the sun shines on the other side. The moon shape we see on earth is actually the region where the moon is lit up by sunlight. The positions of the three are constantly changing, and the bright faces we observe vary in size, creating different moons, such as new moons, moon teeth, half moons, full moons, etc。
When the moon runs between the earth and the sun, the moon's bright side is completely back to the earth, and the dark side is towards us, and it is almost invisible at this point, the new moon. As the moon continues to turn towards the earth, the bright side will gradually grow and become the last moon。
When the earth is in the middle of the moon and the sun, the moon's face is completely directed towards the earth, and the night sky has a full moon. After the full moon has passed, the moon continues to move, with its bright side gradually shrinking, turning into the next string, the rest of the moon, and finally returning to the state of the new moon, completing a full cycle of the month。
The length of the full monthly cycle is relatively constant and is the basis for the calculation of traditional agricultural calendars. The changes in the moon's circle do not have a mystery machine, but are only a natural result of the movement of celestial patterns. Understanding these basic astronomical wisdoms not only solves the puzzles of life, but also allows us to read the unique charms of the natural sciences when looking at the night sky。
