(1):
(n.) An orthographic projection of the sphere on the plane of the meridian, the eye being supposed at an infinite distance, and in the east or west point of the horizon.
(2):
(n.) An instrument of wood or brass, on which this projection of the sphere is made, having a movable horizon or cursor; - formerly much used in solving some common astronomical problems.
(3):
(n.) A scale of the sun's declination for each day of the year, drawn across the torrid zone on an artificial terrestrial globe.
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