Results of the Spectroscopic and Photographic Observations Made at the Royal Observatory, Greenwich, in the Year ... - Royal Observatory Greenwich - Bog

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Results Of The Spectroscopic And Photographic Observations Made At The Royal Observatory, Greenwich, In The Year ...
Royal Observatory, Greenwich
Printed for H.M.S.O. by Darling & Son, 1889
Science; Astronomy; Science / Astronomy; Sun; Sunspots