astronomical position line

astronomical position line

astronomical position lineclick for a larger image
From the geographical position, an arc is drawn which is equal to the zenith distance of the body. A tangent to this arc is the astro position line. To obtain a fix, either another astro, or terrestrial position line is drawn.
A position line obtained by sighting a planetary body.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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