中华万年历

冬至，又称冬节、亚岁、贺冬，是二十四节气中的第22个节气，也是冬季的第四个节气。每年公历12月21日、22日或23日，当太阳到达黄经270°时为冬至。冬至这天，太阳直射南回归线，北半球白昼最短、夜晚最长。冬至过后，太阳直射点开始向北移动，白昼逐渐变长，但气温仍会继续下降。冬至既是二十四节气中一个重要的节气，也是中国民间的传统节日，素有"冬至大如年"的说法。古人认为，冬至是阴阳转化的关键节点，"冬至一阳生"，此后阳气开始回升。冬至在古代也被称为"亚岁"，其重要程度仅次于新年。在中国传统文化中，冬至是祭天祭祖的日子，也是家人团聚的时刻。冬至文化在中国已有数千年的历史，是中华民族宝贵的文化遗产。

Winter Solstice (Dongzhi), also called Winter Festival, Sub-Year, or Winter Greeting, is the 22nd solar term among the 24 solar terms and the fourth solar term of winter, occurring around December 21-23 when the sun reaches 270 degrees celestial longitude. On Winter Solstice day, the sun directly illuminates the Tropic of Capricorn, making it the day with shortest daylight and longest night in the Northern Hemisphere. After Winter Solstice, the sun's direct point begins moving northward, daylight gradually lengthens, though temperatures continue declining. Winter Solstice represents both an important solar term and traditional Chinese folk festival, with saying "Winter Solstice is as significant as New Year." Ancient people considered Winter Solstice the critical Yin-Yang transformation point—"Winter Solstice, one Yang energy arising"—after which Yang energy begins recovering. Winter Solstice was anciently also called "Sub-Year," with importance second only to New Year. In traditional Chinese culture, Winter Solstice is a day for heaven-ancestor sacrifices and family reunions. Winter Solstice culture in China spans thousands of years, representing precious Chinese national cultural heritage.