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Updated: May 26, 2025
On September 19th, 1868, eclipse spectroscopy began with the Indian eclipse, in which all observers found that the red prominences showed a bright line spectrum, indicating the presence of hydrogen and other gases. So bright was it that Jansen exclaimed: "Je verrai ces lignes-la en dehors des eclipses." And the next day he observed the lines at the edge of the uneclipsed sun.
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