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Ole Rmer's Instruments. en Some of Ole Rmer's instruments at Observatorium Tusculanum Vridslsemagle Denmark de Der weltweit erste Meridiankreis aus Ole Rmer's Observatorium Tusculanum Vridslsemagle Dnemark Peder Horrebow Basis Astronomi Creator Peder Horrebow PDold File Observatorium Tusculanum The actual site at Observatorium