A specialized thermometer designed to measure the heating effect of sunlight or solar radiation.
From Greek 'helios' (sun), 'therme' (heat), and 'metron' (measure)—literally 'sun-heat-measurer.' This compound term appeared in 19th-century scientific literature.
A heliothermometer is like a thermometer with sunglasses—it specifically measures how hot the sun's rays make things, which is crucial for solar scientists and engineers designing solar panels.
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