first day of autumn; beginning of autumn
One of the 24 solar terms (二十四節気), marking the traditional start of autumn around August 7–8. Used in calendars and seasonal references.
See also: 二十四節気
This year, the first day of autumn is August 7th.
Even after the beginning of autumn, the hot days continue.
立春 marks the traditional first day of spring (around Feb 4), while 立秋 marks the traditional first day of autumn (around Aug 7) in the same 24 solar-term system.
Standard kanji spelling for this solar term.
From Chinese 立秋 (lìqiū), composed of 立 'to stand, to establish' and 秋 'autumn'. The term was adopted into Japanese as part of the traditional calendar system.