Bible Encyclopedias
Prime Vertical
1911 Encyclopedia Britannica
In astronomy, the vertical circle passing east and west through the zenith, and intersecting the horizon in its east and west points (see Astronomy).
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Bibliography Information
Chisholm, Hugh, General Editor. Entry for 'Prime Vertical'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/p/prime-vertical.html. 1910.