Photography using the sun's light or technology specifically designed to photograph the sun and its features.
From Greek helios (sun) + photography (Greek photos meaning 'light' + graphia meaning 'writing/recording'). This compound combines two 19th-century technologies: heliography (sun-printing) and photography.
The first photographs ever taken of the sun's surface revealed mysterious dark patches called sunspots—and because the sun is so bright, early heliophotography had to use special dark filters that only let a tiny fraction of light through!
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