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Annex aperture appears Astronomer bright Calculation Catalogue circle clock Comet Communicated compared comparison complete computed considerable constant contains corrected crater dark dated declination determined diameter difference direction disk distance ditto Eclipse edge elements employed equal equations Equatoreal error given gives Greenwich inches interesting July June latitude length less letter light limb longitude March Mars mass Mean Mean Solar measures Memoir Mercury method Moon Moon's motion nearly necessary Notices nucleus object observations Observatory obtained orbit passed period planet position present probably Prof Radcliffe reference remarkable respectively ring Royal satellite seen shadow side Society Solar stars Sun's surface Tables taken telescope term tion transit whole