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Mathematical Treasures - Tycho Brahe's astronomical instruments | Mathematical Association of America
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Tycho Brahe: a picture of scientific life and work in the sixteenth century/Chapter 12 - Wikisource, the free online library
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astronomy, measuring instruments, armillary sphere of Tycho Brahe (1546 - 1601), from "Stjerneborg" observatory, colour engraving, end 16th century, Brahe Museum, Ven Stock Photo - Alamy
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Tycho Brahe's Astronomical Instruments Title Page by Library Of Congress/science Photo Library/science Photo Library
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