actinometrical

/ˌæktɪnoʊˈmɛtrɪkəl/
adjective
  1. Relating to the measurement of radiation, especially sunlight.
    • The actinometrical readings were recorded every hour to track solar intensity.
    • Her research focused on actinometrical methods for evaluating solar panel efficiency.
    • The museum displayed an antique actinometrical device used by early meteorologists.
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