...When sunlight enters the Earth's atmosphere and travels close to the ground near the horizon, the light with shorter wavelengths (blue light) is scattered and disappears before it reaches the human eye, leaving only the light with longer wavelengths (red light). The same mechanism also causes the morning glow, when the eastern sky appears red at dawn. Sunsets occur when there are no clouds in the western sky, and since the weather usually moves from west to east in mid-latitudes, weather proverbs also say that a sunset is a sign that clear skies will continue. ... *Some of the terminology that refers to "morning glow" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…太陽光が地球大気に入って,地平線に近い所を地面すれすれに進んで来ると,波長の短い光(青い方の光)は人間の目に届くまでに,散乱によってなくなってしまい,波長の長い光(赤い方の光)だけが残るのである。明け方の東の空が赤く見える朝焼けmorning glowの現象も同じ機構で起こる。夕焼けが起こるのは西の空に雲がない時で,中緯度では天気は西から東へ移るのが普通だから,天気のことわざでも夕焼けは晴天の続く前兆とされている。… ※「morning glow」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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