Heat haze - Mayfly

Japanese: 陽炎 - かげろう

〘Noun〙① A phenomenon in which light and shadow show a subtle flicker. When strong direct sunlight heats the ground, the air close to the ground becomes warm and creates unevenness in the density distribution, causing the light passing through to be refracted irregularly and appear to flicker. It particularly refers to the phenomenon seen in fields on sunny spring days. In waka poetry from the Heian period onwards, it is often used as an analogy for things that seem barely there, things that are incoherent, and things that are visible but have no substance. It is also sometimes confused with "kagerou (mayfly) (1)②" and used as an analogy for something fleeting. Kagiroi. Kageroi. 《Season: Spring》※Hankojo Utaawase (around 893) "When the summer moonlight shines generously, a shadow appears on the flowing water."※Haiku poem, Sarumino (1691) 4 "A fox playing with wild horses (shadows) with its young (Boncho) "② A type of grass. A misunderstanding of ①. [Yakumo Gosho (around 1242)] [Additional notes] There is also a theory that ① is interpreted from the Chinese word "yuito" to mean a certain type of spider's young that spins threads and floats in the sky on the wind on a clear day in mid-late autumn or early spring.

Kagiroi Kagirohi [heat haze]

〘Noun〙① A flickering light seen on a clear spring day due to water vapor rising from the ground. Heat haze. [Season: Spring] *Kojiki (712), Vol. 2, Folk Song: "When I stand on Hanifuzaka Hill and look , I see the burning houses of Kagirohi , around my wife's house." ② The sky that appears reddish at dawn around sunrise . *Man'yoshu (late 8th century), 1.48: "I see flames rising in the eastern fields, and when I look back, the moon is burning." ③ The sky that appears dyed red by flames or other things. [Additional notes] In later times, it came to mean exclusively ①.

Kagiro/ Ukagirofu [heat haze]

〘Self-consciousness Ha-shi〙 Shines red and paints the sky. Also, light and shadow appear to flicker. ※First High School dormitory song, The Color of Spring Flowers (1901) by Kanji Yano "The autumn leaves in the evening are hazy, and the shadows of the setting sun are the color of blood, fading away near the edge of the mountain."

Kagero kagerohi [heat haze]

〘Noun〙 = heat haze (kagero)《Season: Spring》

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:

〘名〙① 光と影とが、微妙なたゆたいを見せる現象。強い直射日光で地面が熱せられ、地面に近い空気が暖められて密度分布にむらができるために、そこを通過する光が不規則に屈折させられて、揺れ動いて見えるもの。特に、春の晴れた日に、野原などで見られる現象をさすことが多い。平安時代以降の和歌では、あるかなきかに見えるもの、とりとめのないもの、見えていても実体のないもののたとえとされることが多い。また、「かげろう（蜉蝣）(一)②」と混同して解され、はかないもののたとえとなることもある。かぎろい。かげろい。《季・春》※班子女王歌合（893頃）「夏の月光惜しまず照る時は流るる水にかげろふぞ立つ」※俳諧・猿蓑（1691）四「野馬(かげろふ)に子共あそばす狐哉〈凡兆〉」② 草の一種という。①を誤解したもの。〔八雲御抄（1242頃）〕[補注]①を、漢語の「遊糸」から、古くは、中晩秋、または初春の快晴の日に、ある種のくもの子が糸を出して風に乗って空を浮遊するものをいったと解する説もある。

かぎろいかぎろひ【陽炎】

〘名〙① 春のうららかな日に、地上から立つ水蒸気によって光がゆらいで見えるもの。かげろう。《季・春》※古事記（712）下・歌謡「埴生坂(はにふざか) わが立ち見れば迦藝漏肥(カギロヒ)の燃ゆる家群(いへむら) 妻が家のあたり」② 明け方の日の出るころに空が赤みを帯びて見えるもの。※万葉（８Ｃ後）一・四八「東(ひむがし)の野に炎(かぎろひ)の立つ見えてかへりみすれば月かたぶきぬ」③ 炎などによって空の赤く染まって見えるもの。[補注]後世は、もっぱら①の意となった。