冬至是我国历法确立的最早节气之一。早在两千五百多年前的春秋时代,中国就已经用土圭观测太阳,测定出了冬至。冬至后来也成为中国的一个重要传统节日,至今仍有不少地方有过冬至节的习俗。冬至的意义从天文学的角度来看,冬至是北半球全天中白天最短、黑夜最长的一天。过了冬至,白天就会一天比一天长,黑夜就会一天比一天短。中国北方各地的气候都会进入一个最寒冷的 The winter solstice is one of the earliest solar terms in our calendar. As early as two and a half years ago in the Spring and Autumn Period, China had already observed the sun with Tuyu and determined the winter solstice. After the winter solstice has also become an important traditional festival in China, there are still many places have the custom of the Winter Solstice Festival. The Significance of the Winter Solstice From an astronomical point of view, the solstice is the longest day of the day and the longest of the night in the entire northern hemisphere. After the winter solstice, the daytime will grow day by day, and the night will be shorter day by day. The climate in all parts of northern China is one of the coldest