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[pahyuh r-hee-lee-om-i-ter, pir-] /ˌpaɪər hi liˈɒm ɪ tər, ˌpɪr-/

noun, Astrophysics.
an instrument for measuring the total intensity of the sun’s energy radiation.
an instrument for measuring the intensity of the sun’s radiant energy
An instrument used to measure the total amount of radiation from the Sun that hits a surface. It works by converting the Sun’s heat into a voltage that is then recorded by a voltmeter.


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