立冬节气：霜降的终结与冬藏的开启 立冬，作为二十四节气中的第十一个节气，意味着“冬，始于土，而万物收藏”。立冬，意味着冬天开始，立冬，是太阳到达黄经 225 度的节点，此时太阳直射点向南移动，北半球开始进入寒冷的冬季，气温显著下降，是寒冷干燥季节的开始。 根据历法记录，立冬的时间是在每年公历的 11 月 7 日或 8 日。例如 2024 年的立冬就在 11 月 7 日，而 2025 年的立冬则会在 11 月 8 日。这一时间点并非固定不变，而是依据北斗七星的斗柄指离方向确定的，体现了古人“以斗定节”的深邃智慧。立冬不仅是一个时间标记，更象征着自然界气象的显著变化，从夏天的炎热与生机转向冬天的肃杀与蓄力。 立冬的气候特征与物候表现 寒冷气候：昼夜温差增大 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