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Spectrohelioscope Reference Libraries

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Spectroheliograph
2010-10-28 18:40:42

The spectroheliograph captures a photographic image of the Sun at a single wavelength of light. The wavelength chosen usually coincides with a spectral wavelength of one of the chemical elements present in the Sun. George Ellery Hale and Henri-Alexadre Deslandres developed I independently in 1890 and was further refined in 1932 by Robert R. McMath to take motion pictures. It operates by...

Word of the Day
prosopography
  • a study of the individuals in a group of people within a specific context and their relationships.
  • In rhetoric, the description of any one's personal appearance.
The word 'prosopography' comes from a Latin word meaning 'description of a person’s appearance' from Greek roots meaning 'face' or 'person' and 'writing'.