Sir Norman Lockyer&#39;s 6.25&quot; Refractor that he used for discovering Helium on the Sun in 1868. Still in excellent working order at the Norman Lockyer Observatory, Sidmouth, Devon UK. #theta360

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Sir Norman Lockyer's 6.25" Refractor that he used for discovering Helium on the Sun in 1868. Still in excellent working order at the Norman Lockyer Observatory, Sidmouth, Devon UK. #theta360

March 15, 2019 22:38

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