French astronomer Pierre Janssen, having traveled to…

August 1868 CE

French astronomer Pierre Janssen, having traveled to Indian 1868 to observe a total eclipse of the sun on August 18 in Guntur, detects a bright yellow line in the spectrum of the solar chromosphere.

The scientific community initially assumes this line to represent the element sodium, when, in fact, it is the undiscovered element later known as helium.

Locations
Guntur Andhra Pradesh India View →

People
Pierre Janssen View →

Groups
Britain (United Kingdom of Great Britain and Ireland) View → France, Second Empire of View → British Raj; India (Indian Empire) View →

Topics
Colonization of Asia, British View →

Subjects
Chemistry View → Astronomy View →

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