Knowra Norman Lockyer Norman Lockyer Norman Lockyer (1836–1920) was an English astronomer who identified a previously unknown line in the Sun’s spectrum in 1868 and proposed that it came from a new element, helium.
Helium : Helium is a chemical element with atomic number 2, first identified in the Sun’s spectrum before its terrestrial discovery. Lockyer named this element after recognizing its spectral signature in sunlight.
Fraunhofer lines : Dark absorption lines in the Sun’s spectrum, named for Joseph von Fraunhofer, that reveal wavelengths absorbed by solar material. Their established pattern provided the spectral background against which Lockyer recognized a new line.
Royal Observatory, Greenwich : The British astronomical observatory founded in 1675 at Greenwich, London, for astronomical and navigational work. Lockyer worked there early in his career before pursuing solar research independently.
Victorian astronomy : Astronomical research and institutions in Britain during the reign of Queen Victoria, from 1837 to 1901. Lockyer’s solar work developed amid rapid growth in British astronomy and scientific publishing.
Discovery of helium : The identification of helium, first detected in the Sun’s spectrum in 1868 and isolated on Earth in 1895. Lockyer’s 1868 observation is the solar beginning of helium’s discovery history.
Solar eclipse of August 18, 1868 : A total solar eclipse observed across parts of Asia, during which astronomers studied the Sun’s spectrum. The eclipse enabled Lockyer to observe solar prominences and their emission lines.
Emission spectrum : A spectrum of wavelengths emitted by excited atoms or molecules as they release energy. Solar prominence emission lines made the helium feature visible for comparison.
Joseph Norman Lockyer : The full name of the English astronomer commonly known as Norman Lockyer. This is the same person under his full name, rather than a separate scientific collaborator.
Spectroscope : An instrument that separates light into a spectrum for examining its wavelengths and features. Advances in spectroscopes made Lockyer’s study of solar lines possible.
Solar eclipse of 1870 : A total solar eclipse observed in the Mediterranean region, providing opportunities for spectroscopic study of the Sun. Lockyer used eclipse expeditions to pursue the solar spectroscopy that had revealed helium.
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