Example image of eyePlorer eyePlorer map for 'Great Paris Exhibition Telescope of 1900': Objective (optics) Refracting telescope Exposition Universelle (1900) 1892 Chamber of Deputies of France Paris Observatory Focal length Heliostat Léon Foucault Champ de Mars, Paris Eiffel Tower Sunspot Théophile Moreux E. M. Antoniadi Nebula Moon Strand Magazine List of largest optical refracting telescopes Yerkes Observatory Alvan Clark & Sons Timeline of telescope technology Optical telescope History of the telescope
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