astronomical meridian plane
astronomical meridian plane
[‚as·trə′näm·ə·kəl mə′rid·ē·ən ‚plān] (geodesy)
A plane that contains the vertical of the observer and is parallel to the instantaneous rotation axis of the earth.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.