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| Keywords: Tycho instrument bipartite arc 15.jpg Tycho Brahe drew the construction of his bipartite arc ARCUS BIPARTITUS MINORIBUS SIDERUM DISTANTIIS INSERVIENS used for measuring the angular distances between celestial objects Source http //www kb dk/elib/lit/dan/brahe/images/instrumentstor15 jpg Author Tycho Brahe in his Astronomiæ instauratæ mecanica Wandsbek 1598 Description source http //www kb dk/elib/lit/dan/brahe/engelsktekst/frame15-en htm PD-old Historical astronomical instruments | ||||
