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astronomical observation
Observation of phenomena occurring in the celestial sphere.
planetarium
Structure where a projector is used to simulate the movement of the celestial bodies on a dome representing half of the celestial sphere.
celestial coordinate system
Imaginary horizontal and vertical lines used to describe the position of an object on the celestial sphere.
radio telescope
Instrument used to capture, concentrate and analyze radio waves emanating from a celestial body or a region of the celestial sphere.
