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亏月或下弦月[1]（英语：Waning Moon）是指月球从满月到新月的月相。开始，在太阳刚刚落下之后，就可以看到亏月的凸月相（半月和满月之间的月相），但是在天空中跟太阳的方向正好相反。一天天过去，月球朝着太阳升起的地方运行并逐渐变小，先变成一半，再变成亏眉月，最终消失不见成新月。[2]
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