photometry
  • Measurement of the intensity of incoming light, using a photometer. Photometric methods are indispensable for magnitude determinations and other observations which provide numerical underpinning for astronomical theory.
  • The science dealing with the measurement of the properties of visible light. Instruments and devices, such as photometers, are used for this purpose. When also dealing with infrared and ultraviolet light, also called radiometry (1).

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