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1911 Encyclopedia Britannica
The angular distance of a heavenly body from the meridian, as measured around the celestial pole. It is equal to the angle at the pole between the hour circle through the body and the meridian, but is usually expressed in time.
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Chisholm, Hugh, General Editor. Entry for 'Hour Angle'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/h/hour-angle.html. 1910.