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n. A medieval instrument, now replaced by the sextant, that was once used to determine the altitude of the sun or other celestial bodies.

n. An astronomical and navigational instrument for gauging the altitude of the Sun and stars.

n. An instrument for observing or showing the positions of the stars. It is now disused.

n. A stereographic projection of the sphere on the plane of a great circle, as the equator, or a meridian; a planisphere.

n. An obsolete astronomical instrument of different forms, used for taking the altitude of the sun or stars, and for the solution of other problems in astronomy.

n. A stereographic projection of the sphere, either upon the plane of the equator, the eye being supposed to be in the pole of the world, or upon the plane of the meridian, the eye being in the point of intersection of the equinoctial and the horizon.

n. an early form of sextant

"The other instrument, called the astrolabe, was a brass circle marked off into 360 degrees."

sextant   

sextant    compass   

planisphere   

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