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Non-inclined orbit
A
non-inclined orbit
is an orbit which is contained in the
plane of reference
. The
inclination
is 0 for prograde orbits, and
p
(180°) for
retrograde
orbits. If the plane of reference is the
equator
, these orbits are called
equatorial
; if the plane of reference is
ecliptic
, they are called
ecliptic
. As these orbits lack
nodes
, the
ascending node
is usually taken to lie in the reference direction (usually the
vernal equinox
), and thus the
longitude of the ascending node
is taken to be zero. Also, the
argument of periapsis
is undefined.
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