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Heliograph is a word derived from helios (Greek Ἥλιος / ἥλιος "sun") and graphein (γραφειν "to write"). It has several uses:

  • the heliograph, a device used for optical signalling
  • a type of sunshine recorder
  • a solar telescope, a telescope especially adapted for viewing the surface of the sun
  • heliography, the photographic process used to make the earliest known permanent photograph from nature


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