今晚月相：18%眉月登場，一次搞懂月亮陰晴圓缺的8個階段
2025年12月24日平安夜，月相為「盈虧眉月」。本文將帶您了解今晚可見的月球地貌、下一次滿月日期，並詳細解說月相週期的8個階段。
平安夜的星空下，月亮正悄然回歸。今晚，一彎僅有18%亮度的眉月，預告著下一次滿月的到來。根據NASA的每日觀測數據，12月24日的月相正是「盈虧眉月」。
今晚看點：肉眼可見的月球地貌
即便沒有專業設備，今晚您也能輕易看見月球表面的「危海」與「豐饒海」。若使用雙筒或小型望遠鏡，更有機會觀測到「恩底彌翁環形山」。上次滿月發生在12月4日，而下一次月圓之時將是1月3日。
何謂月相？一次看懂8大階段
根據NASA的說明，月球圍繞地球公轉一圈，完成一次完整的陰晴圓缺週期，大約需要29.5天，這就是一個「朔望月」。雖然我們看到的永遠是月球的同一面，但隨著它在軌道上運行，其表面反射太陽光的部分不斷改變，從而呈現出不同的樣貌。這個過程主要分為八個階段：
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