Tycho Brahe, the preeminent astronomical observer of the 16th century, established an observatory on the Danish island of Hven in the 1570s. There he built an impressive assortment of astronomical instruments. Among these was a large steel quadrant on an azimuthal base. This engraving representing that instrument was published in Joan Blaeu, Atlas Maior, vol. 1, book 2 (Amsterdam, 1662). It is derived from an engraving that first appeared in Tycho Brahe, Astronomiae Instauratae Mechanica (Wandesburg, 1598).
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