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Norman Lockyer and Pierre Jules César Janssen

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Norman Lockyer and Pierre Jules César Janssen

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He had a very smart and loving family.

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It comes from the Greek word "helios" meaning "sun" after Pierre-Jules-César Janssen observed a new yellow line (587.49 nm) in the solar spectrum of the solar eclipse of 1868.

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Pierre Janssen was born on February 22, 1824.

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Pierre Janssen was born on February 22, 1824.

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