The zodiacal armillary instrument

The zodiacal armillary instrument

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Caption: The zodiacal armillary instrument, one of the instruments at Tycho Brahe's great observatory at Uraniburg on the island of Hveen, Denmark (now Ven, Sweden). The instrument was a copy of one designed by the Greek astronomer Ptolemy and was used to determine the latitudes and longitudes of stars. Two astronomers were needed for each observation, one sighting a fixed star whose position is known, the other sighting the unknown star. The illustration is from Tycho's book Astronomiae Instauratae Mechanica, published in Wandesburgi in 1598.

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Keywords: armillary, astronomical, astronomy, brahe, equipment, historical, history of, instrument, tycho's instrument

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