Spectrohelioscope Reference Libraries
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...
- 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.