What is the name of the moon from the first day to the thirtieth day?

1, the 30th day or the first day of the lunar month is called the new moon or the new moon.

2. The third and fourth days of the lunar calendar are called the New Emei Month.

The seventh and eighth days of the lunar calendar are called the first quarter moon.

In November and December of the lunar calendar, the moon phase becomes a convex moon.

The fifteenth and sixteenth days of the lunar calendar are called the full moon or the moon.

6. On the 18th and 19th day of the lunar calendar, the moon phase becomes a convex moon again.

7. December and March of the lunar calendar are called the last quarter moon.

8. The twenty-seventh and twenty-eighth months of the lunar calendar are called the waning moon.

The reason of moon phase change

The moon shines by reflecting sunlight, which is different from the relative position of the sun (longitude difference), so it will take on various shapes.

1, new moon: the difference between the sun and the moon is 0. At this time, the moon is located between the earth and the sun, with its dark side facing the earth and appearing almost at the same time as the sun, so it can't be seen on the ground. This is the new moon, the first day of the lunar calendar.

2. Chord Moon: The moon continues to rotate forward. On the eighth day of the seventh lunar month, the longitude difference is 90, the sun sets and the moon is already overhead. It didn't fall until midnight. At this time, just half of the moon illuminated by the sun is displayed in front of you. This is the so-called "first quarter moon".

3. Full Moon: On the 15th and 16th day of the lunar calendar, the moon turns to the other side of the earth. At this time, the earth is between the sun and the moon, and the half moon illuminated by the sun is just facing the earth, which is called "looking". Because the moon is just opposite to the sun, the sun sets in the west and the moon rises in the east. When the moon sets, the sun rises in the east, and you can see the bright moon all night.

4. First quarter moon: After the full moon, the moon rises later every day, and the bright part of the moon gets smaller every day. By the 23rd day of the lunar calendar, that is, position 7 in the figure, the longitude of the Yellow Meridian is 270. The full moon is half lost, and then half a moon only appears in the eastern sky in the middle of the night, which is the "lower chord".