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The armillary sphere It is an ancient instrument used until 1600, which was used to determine the Celestial Coordinates of the stars.
It was constituted by a certain number of circles (from which comes its Latin name "armilla", which means circle) inserted into each other, representing the celestial equator, the ecliptic, the horizon, the zodiac, etc., in such a way that, once directed towards a star, its celestial coordinates could be read on graduated scales.
Armillary spheres were used by Arab astronomers, by Hipparchus and Ptolemy. They had a great development at the time during which the Danish astronomer Tycho de Brahe lived (1576-1601), who mounted several in his laboratory.
It is believed that the armillary was invented around 255 B.C. by the Greek astronomer Eratosthenes.
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