Ellipse
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Ellipse
</dt>
A plane curve constituting the locus of all points the sum of whose
distances from two fixed points called focuses or foci is
constant; an elongated circle. See conic
section.
</dd>
The orbits of
planets, satellites, planetoids, and comets are ellipses, the primary being at
one focus. [[/a>|/a>]]
</dd>
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use