One of the twenty-four divisions. It is believed that the beginning of autumn is the beginning of the autumn season. It is the seventh month of the lunisolar calendar (first half of July), which begins on the day when the sun's ecliptic longitude reaches 135° (August 7th or 8th in the solar calendar) and lasts for 15 days until the day before the beginning of the heat (August 23rd or 24th, when the sun's ecliptic longitude is 150°). In the modern calendar, it refers to the first day of this period. When the heat passes its peak and the beginning of autumn is heard, the season suddenly becomes cool. In ancient China, this period was further divided into three periods (cool breeze arrives, white dew falls, and cold cicadas sing) with each period lasting five days. This means the period when autumn breezes blow, dew forms on the grass leaves, and higurashi (cold cicadas) sing. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
二十四節気の一つ。立秋を迎えて秋の季節が始るとした。太陰太陽暦の七月節 (7月前半) のことで,太陽の黄経が 135°に達した日 (太陽暦の8月7日か8日) に始り処暑 (太陽の黄経 150°,8月 23日か 24日) の前日までの 15日間であるが,現行暦ではこの期間の第1日目をさす。暑さも峠を越して立秋の声を聞くようになると,急に涼風がそよぐ時期になる。昔中国ではこの時期をさらに5日を一候とする三候 (涼風至,白露降,寒蝉鳴) に区分した。それは,秋のそよ風が吹き,草葉に露を結び,ひぐらし (寒蝉) が鳴きすさぶ時期の意味である。
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