Astrophotometry is the branch of astronomy that deals with quantitative measurements of the brightness of celestial objects. Some synonyms for astrophotometry include astronomical photometry, stellar photometry, celestial photometry, and star brightness measurement. These terms all refer to the same process of measuring the amount of light coming from a celestial object in a specific wavelength range. The data collected through astrophotometry can be used to determine the distance, size, temperature, and other parameters of celestial objects, including stars, galaxies, and nebulae. The use of different synonyms highlights the multi-faceted nature of astrophotometry as a critical technique for understanding the universe.