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GREENWICH OBSERVATORY. GREAT ASTRONOMERS by SIR ROBERT S. BALL D.Sc. LL.D. F.R.S. Lowndean Professor of Astronomy and Geometry in the University of Cambridge Author of "In Starry Realms" "In the High Heavens" etc. WITH NUMEROUS ILLUSTRATIONS PREFACE. It has been my object in these pages to present the life of each astronomer in such detail as to enable the reader to realise in some degree the man's character and surroundings; and I have endeavoured to indicate as clearly as circu