In earlier chapters we discussed such topics as the radiant flux emitted by the Sun, planets, and the stars; the luminosity, surface temperatures, and observed flux from these objects at the Earth; the photographic detection of starlight and sunlight; and the surface brightness and intensity of extended objects. These topics all involve photometry to some degree. Now we describe how the light of the stars is detected by photoelectric photometry, a high-precision method of measuring the flux and color of starlight, and photometry by area detectors such as charge-coupled devices.
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