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altitude: angle above and perpendicular to the horizon, or an angular elevation above the horizontal direction in the same azimuth.
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altitude dial: sundial measuring time from the altitude of the sun.
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armillary sphere: set of rings corresponding to the circles of the celestial sphere, see article on the armillary sphere.
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aspectarium: aide-memoire which depicts the astrologically significant angles (or aspects) between the planets.
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astrolabe: astronomical instrument based on a planispheric projection of the heavens, see article on the astrolabe.
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