《礼记·月令》
初春正月：太阳运行的位置在营室；黄昏时，参星位于南天正中；拂晓时，尾星位于南天正中。
孟春之月，日在营室，昏参中，旦尾中。
First month of early spring: The location of the sun is in Yingshi; at dusk, the stars of Shen are right in the middle of the southern sky; at dawn, the stars of Wei are right in the middle of the southern sky. 