What day of the month is the new moon?

The first day of each month in the lunar calendar is called the "new moon" day, and the "hope" day refers to the fifteenth day of each month in the lunar calendar. It is called "new moon" because on this day, the moon will run between the sun and the earth, and it will appear and disappear at the same time as the sun. At this time, the earth can't see the moonlight, so it is called "new moon".

The origin of the name "looking at the sun" is because the moon is the roundest on 15 (sometimes 16 or 17) of each month in the lunar calendar, and the sunset and the moon rise at the same time, so the day and the month can see each other, so it is called looking at the sun.

Another explanation

1, at the same time, these are two extremes. "No moon is a new moon, and a full moon is hope." It expresses people's yearning and hope for things, and also explains the eternal laws of nature, from scratch, from existence to nothingness, endless and eternal.

2. In classical Chinese, Wang Shuo means the first and fifteenth days of each month in the lunar calendar. For example, officials at all levels still go to court on the first and fifteenth days of each month (Biography of Zhang Ning in the Ming Dynasty).