What does the moon look like in the lunar calendar 17?

Most of the round surface of the moon is bright, so it is called a convex moon. The convex moon before the full moon (that is, 12 and 13 of each lunar month) is called the "gradual surplus convex moon", also known as the "upward convex moon", and the bright part faces the west. It usually rises before sunset and disappears before sunrise the next day; The convex moon after the full moon (that is, 17 and 18 of each month in the lunar calendar) is called the "waning convex moon", also known as the "downward convex moon", and the bright part faces the east. It usually rises after sunset and disappears after sunrise the next day. The convex moon mainly appears at night, and the larger the bright part, the longer it appears at night.

Extended data

The first quarter moon and the last quarter moon, the waning moon and the waning moon are similar in appearance, but their appearance time, position and bright surface direction are different. The waning moon and the first quarter moon appear in the western sky in the evening and the first half of the night respectively, and their "faces" are facing west, that is, the western half is bright; The waning moon and the last quarter moon appear in the eastern sky after dawn and midnight respectively, and their "faces" face the east, that is, the eastern half is bright.

Because the date of the China lunar calendar is arranged according to the moon phases, the working people in ancient China sometimes rely on it to judge the date of the China lunar calendar and the approximate time of night. It takes an average of 29.53 days for the moon to move from the new moon position to return to the new moon position, which means that the average replacement period of the moon phase is 29.53 days, which is called a "new moon".