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6月21日夏至就是炎热的夏天来临。这一天是北半球白昼最长、黑夜最短的一天,从这一天起,进入炎热季节,天地万物在此时生长旺盛。夏至以后地面受热强烈,空气对流增强,午后至傍晚常易形成雷阵雨。这种雷雨骤来疾去,降雨范围小,人们称为“夏雨隔田坎”。唐代诗人刘禹锡曾巧妙地借喻这种天气,写出“东边日出西边雨,道是无晴却有晴”的著名诗句。
The summer solstice on June 21 is a hot summer. This day is the longest day in the northern hemisphere, the shortest day of the night, from this day, into the hot season, all things heaven and earth at this time strong growth. After the summer solstice, the ground was heated strongly and the air convection increased. It is easy to form thunderstorms in the afternoon and evening. This thunderstorm suddenly go disease, a small rainfall range, people called “summer rain across Tiankan ”. The poet Liu Yuxi of the Tang Dynasty cleverly borrowed this kind of weather to write a famous poem entitled “Sunrise on the west side of the river, rain on the west side but clearness on the road.”