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| Keywords: 20060825 Ole Rømer's Instruments.jpg en Some of Ole Rømer's instruments at Observatorium Tusculanum Vridsløsemagle Denmark de Der weltweit erste Meridiankreis aus Ole Rømer's Observatorium Tusculanum Vridsløsemagle Dänemark Peder Horrebow Basis Astronomiæ 1735 1735 Creator Peder Horrebow PD-old-100 <gallery widths 100px > File 20060821 Observatorium Tusculanum jpg The actual site at Observatorium Tusculanum where the instrument was installed overview File Observatorium Tusculanum 2009-07-14 jpg The actual site at Observatorium Tusculanum where the instrument was installed detail </gallery> Celestial coordinate systems Observatorium Tusculanum Meridian instruments | ||||
