三九的第一天，是中国传统节气文化中“数九寒天”的一个重要节点。‘数九’是从冬至开始计算的，每九天为一个‘九’，共九个‘九’，总计八十一天。‘三九’即第三个九天周期，通常被认为是一年中最寒冷的时段。因此，‘三九的第一天’标志着严寒高峰的开始。在中国民间，有‘一九二九不出手，三九四九冰上走’的谚语，形象地描述了随着‘九’的推进，天气愈发寒冷的情景。三九期间，北方地区常出现持续低温、冰冻和降雪，而南方虽无严寒冰雪，但也湿冷难耐。为了抵御寒冷，人们在三九天有诸多养生习俗，如喝姜茶、吃羊肉、泡脚等，以温补阳气、驱寒保暖。近年来，‘三九贴’（一种中医外治疗法）也逐渐流行，被认为可增强免疫力、预防冬季疾病。从现代气象角度看，三九之所以最冷，是因为冬至后地表热量持续散失，而太阳辐射尚未明显增强，导致气温降至全年最低点。因此，三九第一天不仅承载着传统文化的智慧，也体现了古人对自然规律的细致观察。
The first day of ‘San Jiu’ (the third ‘nine-day period’) marks a significant point in China’s traditional ‘Counting Nine’ winter custom. This practice begins on the Winter Solstice, dividing the coldest part of winter into nine periods of nine days each—totaling 81 days. ‘San Jiu,’ or the third nine-day cycle, is widely regarded as the coldest time of the year, making its first day the onset of peak winter chill.A well-known Chinese folk saying goes: ‘During the first and second ‘jiu,’ you keep your hands tucked away; during the third and fourth, you can walk on ice.’ This vividly illustrates how temperatures drop progressively with each ‘jiu.’ In northern China, San Juan often brings prolonged freezing weather, snow, and icy conditions, while southern regions experience damp, penetrating cold despite less snowfall.To combat the cold, people follow various health-preserving traditions during San Jiu, such as drinking ginger tea, eating lamb, and soaking feet in warm water—all aimed at warming the body and boosting yang energy. In recent years, ‘San Jiu patches,’ a form of traditional Chinese herbal therapy applied to acupoints, have gained popularity for their purported ability to strengthen immunity and prevent winter illnesses.From a modern meteorological perspective, San Jiu is the coldest because, after the Winter Solstice, the Earth continues losing more heat than it receives from the sun until solar radiation gradually increases. Thus, the first day of San Jiu not only reflects ancient wisdom about seasonal rhythms but also demonstrates the keen observational skills of traditional Chinese culture toward natural phenomena.
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