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Illustration of a parallactic instrument from Tycho Brahe's observatory at Uraniborg, Hven, Denmark (now Sweden). It was used for measuring the altitudes (angular heights above the horizon) and azimuths (angular positions along the horizon) of stars. Brahe (1546-1601) is considered the greatest astronomical observer of the pre-telescopic era. This illustration is from a 1602 edition of Tycho Brahe's Astronomiae Instauratae Mechanica (Astronomical Instruments). In this book, first published in 1598, he described the astronomical instruments he invented and used to make his astronomical measurements.
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