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astrolabe quadrant: quadrant that has many of the lines and functions of the ordinary astrolabe, projected for a single latitude.
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astrolabum catholicum: type of universal astrolabe, see article on the astrolabe.
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astrological houses: 12-part division of the heavens centred on the celestial pole, also called 'houses of heaven', see article on the astrolabe.
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astrological instrument: an instrument whose primary use was for astrological purposes, such as casting horoscopes, rather than for observational astronomy.
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astronomical clock: a clock incorporating astronomical instruments such as an astrolabe or armillary sphere.
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