principal vertical circle

principal vertical circle

[′prin·sə·pəl ′vərd·ə·kəl ‚sər·kəl]
(geodesy)
The vertical circle through the north and south points of the horizon, coinciding with the celestial meridian.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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