Article ID: CBB885852744

Observations of the total solar eclipse of 18 August 1868 carried out by Jules Janssen at Guntoor, India (2021)

unapi

Due to its exceptional length, the 18 August 1868 total solar eclipse gave the French physicist Jules Janssen a very good opportunity to have spectroscopic observations put into practice to study the famous prominences that could be seen only during total eclipses. He not only saw the hydrogen lines he was so interested in, but he discovered too that it also would be possible to observe these lines at any time, without waiting for the next eclipse. This ‘prominence method’ was independently discovered by Britain’s Norman Lockyer at the same time, and was deemed so important and promising that the French Académie des Sciences struck a special medal in honour of both scientists.

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Authors & Contributors
Launay, Françoise
Kragh, Helge S.
Kapoor, R. C.
Baldwin, Melinda Clare
Jean-Marie Malherbe
Raulin Cerceau, Florence
Concepts
Astronomy
Spectroscopy
Eclipses; transits; occultations; conjunctions
Periodicals; serials
Physics
Biographies
Time Periods
19th century
20th century, early
20th century
21st century
Places
France
India
Great Britain
Paris (France)
Institutions
Macmillan
East India Company (English)
Observatoire de Paris
Madras Observatory
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