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Reference.org
Keyhole problem
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<p>The keyhole problem, in the context of <a href="/facts/Astronomy/0ArJVM1p">astronomy</a>, refers to the difficulty that <a href="/facts/Horizontal_coordinate_system/msJQPYg0">azimuth-elevation</a> type telescopes or antenna <a href="/facts/Gimbal/FI8hEuss">gimbal</a> systems encounter in crossing the <a href="/facts/Zenith/ISuRFp05">zenith</a>. </p>