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date: 21 February 2019

A band 

Source:
A Dictionary of Astronomy
Author(s):
Ian RidpathIan Ridpath

A broad *Fraunhofer line in the Sun’s spectrum at around 759 nm, due to absorption by oxygen in the Earth’s atmosphere. Because the oxygen is in molecular form, the A band is actually a group of close, regularly spaced lines over the range 759–768 nm, unresolved at low resolution.... ...

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