Line of Apsides
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Line of Apsides
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The line connecting the two points of an orbit
that are nearest and farthest from the center of attraction,
as the perigee and apogee
of the moon or the perihelion
and aphelion of a planet; the major
axis of any elliptical orbit
and extending indefinitely in both directions.
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References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use