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Observatoire de Nice Observatoire Imperial de Paris. Service Meteorologique des Ports. Lettre du Directeur de l'Observatoire imperial de Paris a M. Airy, Astronome Royal d'Angleterre Observatories of the World Observatorium Tusculanum "Observatory House, Slough (Home of the Herschels)" "Observatory" Observer's handbook Observo ergo sum: Tadeusz Banachiewicz, 1882-1954 Obserwatorium astronomiczne Uniwersytetu Jagiellonskiego Obsolete methods of reckoning time "Obstetrics and Gynaecology in Oxford 1770-1970" Occhiali da Vedere: Arte, Scienza e Costume Attraverso gli Occhiali Occultations of Planets and Stars by the Moon, during the Year 1853. Computed ... at the Expense of the Fund Appropriated by Congress for the Establishment of a Nautical Almanac and published by the Smithsonian Institution "Ochava Espera" y "Astrofisica": Textos y Estudios sobre las Fuentes Arabes de la Astronomia de Alfonso X Ocherki po istorii russkoi astronomii Octary Arithmetic; or, The Art of Doubling and Halving by the Cypher: Containing a Perfect System of Measure and Weight, with Specimens of the New Logarithms Octavo Oculus Artificialis Teledioptricus sive Telescopium ex Abditis, etc. Oculus Artificialis Teledioptricus sive Telescopium, ex Abditis rerum Naturalium & Artificialium principiis protractum nova methodo, eaque solida explicatum ac comprimis e triplici Fundamento. Physico seu Naturali, Mathematico Dioptrico et Mechanico, seu Oculus hoc est: Fundamentum Opticum, in quo ex Accurata Oculi Anatome, Abstrusarum Experientiarum Sedula pervestigatione, ex invisis specierum visibilium tam everso quam erecto situ spectaculis, nec-non solidis rationum momentis. Radius Visualis Eruitur:
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