摘要
立秋是二十四节气中的第13个节气,在每年公历8月7一9日。古人发现,每当北斗星的“斗柄”指向地支申的方向,天气就会转凉,后定此时为立秋。“秋”是收获的季节,也意味着禾谷成熟。正所谓“立秋之日凉风至”,立秋过后,最大的变化就是暑气消退,天气转凉。随着气温下降,树叶逐渐枯黄并落下,这就是“落叶知秋”。虽然此时已经开始进入秋季,但并不代表秋天已经来临。气象学定义,当一个地方连续五天的平均气温在22℃以下,才算真正入秋。
Liqiu,or the Beginning of Autumn,is the 13th solar term among the 24 Solar Terms,occurring between August 7 and 9 on the Gregorian calendar.Ancient Chinese discovered that when the handle of the Big Dipper points to the direction of the Earthly Branch Shen(the ninth Earthly Branch in the Chinese lunar calendar system),the weather turns cooler,and hence this time of year became known astheBeginningof Autumn.
