FACTOID # 21: 15% of Army recruits from South Dakota are Native American, which is roughly the same percentage for female Army recruits in the state.
 
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Encyclopedia > Argument of Perihelion

The argument of the perihelion is one of the orbital elements describing the orbit of a planet. It is used to describe the longitude of the perihelion of the planet's orbit around the sun. It is the angle from ascending node to perihelion (in the orbital plane).


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Argument of the perihelion (349 words)
The argument of periapsis (ω) is the orbital element describing the angle of an orbiting body's periapsis (the point of closest approach to the central body), relative to its ascending node (the point where the body crosses the plane of reference from South to North).
An argument of periapsis of 0° means that the orbiting body will be at its closest approach to the central body at the same moment that it crosses the plane of reference from South to North.
An argument of periapsis of 90° means that the orbiting body will reach periapsis at its northmost distance from the plane of reference.
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