astronomical longitude

astronomical longitude

[‚as·trə′näm·ə·kəl ′län·jə‚tüd]
(geodesy)
The angle between the plane of the reference meridian and the plane of the local celestial meridian.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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In case of astronomical longitude the repeatability is much worse.
Automatic determination of the deflections of the vertical--first scientific results

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