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Prime Vertical |
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Prime Vertical
the great circle of the celestial sphere that passes through the zenith and the eastern and western points on the horizon. The plane of the prime vertical is perpendicular to the plane of the horizon and the plane of the celestial meridian. All heavenly bodies, which pass through the prime vertical as a result of the diurnal motion, intersect the prime vertical at the same velocity with respect to altitude and azimuth (for a given terrestrial latitude). Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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