Excuse me, is the "twelve places supporting the construction of the moon" on the first day of the first lunar month or the "ugly construction" on the first day of February?

No, Yin Jian is in the first month, and the sword is in October.

December is a solar month based on 24 solar terms, which is the basic content of the dry calendar. Taking the direction pointed by the bucket handle of the Big Dipper as the standard for determining the month is called "sword fighting", and "sword" represents the direction of the top of the bucket handle of the Big Dipper. Bucket handle rotates and points to "Twelve Chens" in turn, which is called "December Building". December is twelve solar months. Bucket handle, the Big Dipper, rotates east, south, west and north, and is called one year old (Figure). In the official calendar, one year is divided into December ("December Day" or "December Order"), and each month has two solar terms.

Branches are related to the time position of gossip. Yin position is the root position of gossip the day after tomorrow, and it is the position at the end of the year and the beginning of the year, representing the end and beginning. For example, "Yi Shuo Gua Zhuan": "Gen, the divination in the northeast is also the beginning of all things." That is to say, bucket handle starts from the north of due east (Yin position, acquired gossip position), and the east, south, west and north make a circle as a cycle, which is called one of the "years old" (Figure). Yi copula: cold and summer push each other and grow old.