"Shuoyue" refers to the lunar calendar when?

When the moon runs between the sun and the earth and the dark hemisphere of the moon faces the earth, it is called a new moon.

This is the first day of the lunar month. We can't see the moon at this time, so it's called the new moon. The sun on the new moon is called the new moon.

"Poem Xiaoya at the Turn of October": "At the turn of October, the bright moon shines high, and there is food every day, which is also ugly." Zheng Xuan wrote: "October in a week is also August in summer. In August, the sun and the moon meet. "

"Book of Rites Jade Algae": "Less prison in a month, five years and four years."

"Shuori doesn't mean auspicious day" in Jing Yi Wenshutong Shuo Shang introduced by Wang Qing: "The beginning of January means Shuori or Shuoyue."