Measurement of the properties of light, especially luminous intensity.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "photometry" in a sentence
"Christie: There are lots of ways you can get involved in observational astronomy, but in talking about photometry, which is a measurement of star brightness, you basically just need a telescope with as much aperture as you can afford."
"That's called photometry, and that's primarily what we do."
"The worry was not about the pipeline itself, which by then Robert Lupton was writing and which was working beautifully, but about precision of the photometry going into it."