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One of about a dozen of the strongest Fraunhofer lines seen in the Solar spectrum, the A band at 7600 angstoms is due to telluric lines of molecular oxygen in the Earth's atmosphere. (originally thought to originate in the Sun by Fraunhofer.)

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Parte del discorso: sostantivo
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Settore/Dominio: Astronomia
Categoria: Astronomia (generale)
Company: Caltech
Prodotto:
Acronimo - Abbreviazione:

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the light produced by excited atoms and ions in the upper atmosphere of a planet

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1) Angular distance from the north point eastward to the intersection of the celestial horizon with the vertical circle passing through the object and the zenith. 2) Directional ...