《吕氏春秋·纪·季秋纪》
季秋季秋九月，太阳的位置在房宿。初昏时刻，虚宿出现在南方中天，拂晓时刻，柳宿出现在南方中天。
一曰：季秋之月，日在房，昏虚中，旦柳中。
In the ninth month [Sept. 23-Oct. 21] of Autumn the sun's position is in the constellation Fáng. At dusk Xū is in the middle of the southern sky and at dawn Liǔ is in the middle of the southern sky.