Detailed explanation in Chinese:
1, the crescent moon at the beginning of each month in the lunar calendar.
2. The fifteenth full moon of the first lunar month.
3. the moon and the moon. At this time, the moon is between the earth and the sun, and its shadow is opposite to the earth. There is no moonlight on the earth, which is called the new moon.
The symbolic significance of the new moon in religion;
The "new moon" is a religious symbol of Islamic countries. It is a free translation of Arabic "Helal", which originally refers to the first quarter moon, commonly known as the crescent moon. Astronomically called "new moon", it means that the moon passes through the phase between the sun and the earth. Its symbolic meaning is rising, rebirth, happiness, auspiciousness, the first light and a new time. The new moon symbolizes that Islam has opened a new era for human civilization.
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Explanation of the cause of the new moon in astronomy;
The different phases of the moon are related to the direction of observing the moon. If you look at the moon from the opposite direction to the sun, it is completely black, and the moon at this time is called the new moon; On the other hand, if you look at the moon from the direction of the sun, it is all bright, and the moon at this time is called the full moon.
The change of the moon phase is a process from the new moon to the full moon and from the full moon to the new moon. When the new moon appears, the moon and the sun are on the same side of the earth, which is called the conjunction of the sun and the moon, also known as the "new moon". When the full moon appears, the moon and the sun are located on both sides of the earth, which is called the collision between the sun and the moon, also called "looking". So the change of the moon phase can also be called the change of the moon.
Baidu encyclopedia-crescent moon