“数九”，为何从冬至开始？

Core Viewpoint - The article discusses the traditional Chinese counting method of "Shu Jiu" (数九), which begins on the winter solstice and marks the transition from winter to spring, highlighting its cultural significance and the timing of the 2026 Spring Festival [1][3][4]. Group 1: "Shu Jiu" Overview - "Shu Jiu," also known as "Winter Jiu," starts from the winter solstice and counts every nine days as a unit, culminating in 81 days, which signifies the arrival of spring [3][6]. - The folk song associated with "Shu Jiu" illustrates weather characteristics and agricultural activities during this period, emphasizing its cultural relevance [3][6]. Group 2: 2026 Spring Festival Timing - The 2026 Spring Festival falls on February 17, 2026, which is relatively late compared to previous years, as it coincides with the "Seven Jiu" period from February 13 to February 21 [3][4]. - The delay in the Spring Festival's timing is attributed to the occurrence of a "leap June" in 2025, affecting subsequent festivals like the Mid-Autumn Festival and the Spring Festival [4]. Group 3: Weather and Agricultural Implications - The "Seven Jiu" period is expected to align with the warming trend, potentially allowing for the phenomenon of "river opening" to occur if temperatures remain above zero degrees Celsius [6]. - The article emphasizes the importance of traditional knowledge in understanding seasonal changes and agricultural practices, as reflected in the "Shu Jiu" counting method [6].