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celestial meridian

celestial meridian, vertical circlepassing through the north celestial pole and an observer's zenith. It is an axis in the altazimuth coordinate system.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2007, Columbia University Press. All rights reserved.

More on celestial meridian from Infoplease:

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culminate - culminate culminate, in astronomy, the maximum height in the sky reached by a celestial body on a ...
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