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The second category pertains to instruments employed for recording or standardizing the data provided by the observational instruments.Spectrographs may be used to evaluate light, whereas photoelectric cells can be employed to measure luminosity.So this is, in a very brief way, how do we observe, and how do we get the data about the astronomical objects.
(a) An apparatus for photographing or mapping a spectrum. (b) A photograph or picture of a spectrum.
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