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It is the study of the luminous variations of a celestial object.
The case of the study of the luminous fluctuations of the variable stars is classic, in order to determine the light curve and the causes of such variations.
However, photometry is also applied to the study of objects that populate our solar system, to extract indirect clues about its physical constitution and its dynamic characteristics.
At one time, photometry was performed with the naked eye, without the help of instruments, and the luminosity measurements of a celestial body were made by comparison with stars of well known magnitude. Today, instead, sophisticated instruments called Photometers are used, which ensure greater accuracy and reliability of determinations.
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