Extinction - Genkou (English spelling)
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The phenomenon in which light from stars and the Sun is lost due to absorption by the Earth's atmosphere. The brightness of a star varies depending on the wavelength of light, the weather conditions at the time of observation, the zenith distance, etc. To correct for this, the apparent brightness is measured for each wavelength at various zenith distances to obtain the correct luminosity and spectrum. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
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地球大気による吸収作用で，星や太陽の光が損失する現象。星の明るさは，光の波長，観測の際の気象条件，天頂距離などによって変化する。その補正には種々の天頂距離で各波長ごとに見かけの明るさを測定して，正しい光度とスペクトルを求める。
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