The keyhole problem, in the context of astronomy, refers to the difficulty that azimuth-elevation type telescopes or antenna gimbal systems encounter in crossing the zenith. == Area of visible sky == To track celestial objects as they move across the sky, these systems usually rotate on two axes.
The keyhole problem, in the context of astronomy, refers to the difficulty that azimuth-elevation type telescopes or antenna gimbal systems encounter in crossing the zenith. == Area of visible sky == To track celestial objects as they move across the sky, these systems usually rotate on two axes.
Source: Wikipedia "Keyhole problem" · CC BY-SA 4.0
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