Tycho's wall quadrant. An engraving of tycho brahe in his uraniborg observatory on the island of hven, probably from the 1598 printing of his astronomiae instauratae mechanica, hand coloured. The engraving shows the painting above the quadrant that brahe had commissioned to be made in 1587 by the painters hans knieper, hans van steenwinckel the elder and tobias gemperle who were responsible, respectively, for the painting of the landscape at the top, the three arches representing the three areas of uraniborg and the portrait of brahe. Date: 1598 (original woodcut or engraving) later coloured at unknown date.
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