'Two Frogs in a Pond' (c. 1930) by Watanabe Seitei
Today is 'Rikka' [立夏], the first day of summer in the traditional Japanese calendar
and the first day of one of my favourite kō (micro-season), the one in which frogs start croaking [蛙始鳴 'Kawazu hajimete naku', 5-9 May]
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立夏是中国历法。真想骂人。日本都是拷贝中国历法，中国 农历的24节气，整个亚洲只要有用这种古老历法的都是学的中国历法，这是中国古人用来适合农耕的时节变化的历法。日本连汉字都没改，你应该学学中国文化，连日本人都不敢说这叫日本历法