Non-inclined orbit

equatorial orbitequatorialEcliptic orbit
A non-inclined orbit is an orbit coplanar with a plane of reference.wikipedia
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Orbital node

Nodeascending nodenodes
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.
A non-inclined orbit, which is contained in the reference plane, has no nodes.

List of orbits

equatorialjovicentricorbital classifications
* List of orbits

Longitude of the ascending node

right ascension of the ascending nodelongitude of ascending nodenode
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.
For non-inclined orbits (with inclination equal to zero), Ω is undefined.

Argument of periapsis

argument of perihelionargument of perigeeargument of pericenter
Also, the argument of periapsis is undefined.

Orbit

orbitsorbital motionplanetary motion
A non-inclined orbit is an orbit coplanar with a plane of reference.

Coplanarity

coplanarnon-coplanarcontained
A non-inclined orbit is an orbit coplanar with a plane of reference.

Plane of reference

reference planeplaneplanes
A non-inclined orbit is an orbit coplanar with a plane of reference.

Orbital inclination

inclinationinclinedtilted
The orbital inclination is 0° for prograde orbits, and π (180°) for retrograde ones.

Pi

ππ\pi
The orbital inclination is 0° for prograde orbits, and π (180°) for retrograde ones.

Retrograde and prograde motion

retrogradeprograderetrograde orbit
The orbital inclination is 0° for prograde orbits, and π (180°) for retrograde ones.

Spheroid

oblate spheroidoblateprolate spheroid
If the plane of reference is a massive spheroid body's equatorial plane, these orbits are called equatorial; if the plane of reference is the ecliptic plane, they are called ecliptic.

Celestial equator

equatorialequatorial planeequatorial sky
If the plane of reference is a massive spheroid body's equatorial plane, these orbits are called equatorial; if the plane of reference is the ecliptic plane, they are called ecliptic.

Ecliptic

ecliptical orbitsecliptic planeplane of the ecliptic
If the plane of reference is a massive spheroid body's equatorial plane, these orbits are called equatorial; if the plane of reference is the ecliptic plane, they are called ecliptic.

March equinox

vernal equinoxspring equinoxNorthward equinox
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.

Geostationary orbit

GeostationaryGEOgeostationary satellite
Geostationary orbit is a geosynchronous example of an equatorial orbit.

Geosynchronous orbit

geosynchronousGEOGSO
Geostationary orbit is a geosynchronous example of an equatorial orbit.

Astrosat

Astrosat-1Cadmium Zinc Telluride Imager
Astrosat is a multi-wavelength astronomy mission on an IRS-class satellite into a near-Earth, equatorial orbit.

Charge Composition Explorer

AMTPE/CCECCE
It was placed in an equatorial orbit of 1,100 km × 50,000 km with an inclination of 4.8 degrees.

Communications satellite

satellite communicationssatellitecommunication satellite
This is because it revolves around the Earth at Earth's own angular velocity (one revolution per sidereal day, in an equatorial orbit).

Atmosphere of Venus

atmosphereVenusian atmosphereVenus
The super-rotation on Venus is differential, which means that the equatorial troposphere super-rotates more slowly than the troposphere at the midlatitudes.

Phobos 1

The probe would then rendezvous with Phobos; drop a lander containing scientific equipment from an altitude of 50 meters, and move into a final equatorial orbit above Mars where it would study the martian surface and atmosphere.

Small Astronomy Satellite 2

SAS-2Second Small Astronomy SatelliteExplorer 48
SAS-2 was launched from the San Marco platform off the coast of Malindi, Kenya, into a nearly equatorial orbit.

99942 Apophis

Apophis(99942) Apophis99942 Apophis Mission Design Competition

Yi Xing

Xing, YiZhang Sui
It was the earlier Chinese inventor Zhang Heng during the Han dynasty who was the first to apply hydraulic power (i.e. a waterwheel and water clock) in mechanically-driving and rotating his equatorial armillary sphere.