The Study of The Solar Spectrum ( Major Trends In The History of Astronomy)

The dark lines in the solar spectrum, noted by Wollaston in 1802, were first mapped systematically by the physicist Joseph Fraunhofer. By 1817 Fraunhofer had described hundreds of lines and bands, the principal ones to which he assigned letters A, B, C and so on, which are used even today…. Read more“The Study of The Solar Spectrum ( Major Trends In The History of Astronomy)”

Early Solar Observations ( Major Trends In The History of Astronomy)

Nineteenth-century ideas on the nature of the Sun can he divided into two distinct periods: the first characterized by the simple visual observations of sunspots, the second, by the application of photography and spectroscopy to the Sun. In the early nineteenth century, sunspots were the major clue to the nature… Read more“Early Solar Observations ( Major Trends In The History of Astronomy)”