actinograph
noun
ac·tin·o·graph
ak-ˈtin-ə-ˌgraf 
: an instrument for determining the intensity of direct solar radiation
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“Actinograph.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/actinograph. Accessed 19 Apr. 2024.
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