The practice or art of observing and studying the sun using a helioscope or similar optical instruments.
From Greek 'helios' (sun) and 'skopein' (to observe), plus '-y' (practice or field of study), describing the discipline of solar observation.
Helioscopy revolutionized astronomy when scientists could finally safely study the Sun's surface—they discovered sunspots that proved the Sun wasn't perfect, fundamentally changing how people understood the cosmos!
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