在古代,夏至是一年中最早被赋予意义的日子。立竿见影观测太阳变化时,冬至和夏至应该是最早被注意到的两个点。夏至是在农历五月中,太阳走到北回归线,这是一年中白天最长的日子,也是阳光投下的日影最短的日子。因此,夏至被古人看成是一个重要的时间转折点。大自然在夏至经历了一个重要的阴阳转换,盛阳之内,一阴已生。东汉应劭《风俗通义》中记载,古代在夏至会吃用龟做的汤羹,原因就是龟骨在外以阳 In ancient times, the summer solstice was the earliest meaning of the year. Immediate Observations When the sun changes, the winter solstice and the summer solstice should be the first two points to be noticed. The summer solstice is in the lunar month of May, the sun went to the Tropic of Cancer, which is the longest day of the year in a year, but also the sun shines the shortest day. Therefore, the summer solstice is seen by the ancients as an important time turning point. Nature experienced an important transformation of yin and yang during the summer solstice. The Eastern Han Dynasty should 劭 “customs Tongyi” records, ancient times in the summer solstice will eat soup made of turtles, the reason is the turtle outside Yang