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| Keywords: Tycho instrument arc 18.jpg Tycho Brahe drew the construction of a lightweight instrument ALIUD INSTRUMENTUM SIMILE PRIORI PRO DISTANTIIS used for measuring the angular distances between celestial objects Source http //www kb dk/elib/lit/dan/brahe/images/instrumentstor18 jpg Author Tycho Brahe in his Astronomiæ instauratæ mecanica Wandsbek 1598 Description source http //www kb dk/elib/lit/dan/brahe/engelsktekst/frame18-en htm PD-old Historical astronomical instruments | ||||
