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argument of the perihelion comparison table
Subject has unit has definition has symbol see also is requir has synonym is a kind of is an instance of
angleangle unit     quantity 
orbital element One of seven quantities that must be established from observations in order to define the size, shape, and orientation of an orbit in space. osculating elementto define the size, shape, and orientation of an orbit in space orbital quantity 
argument of the perihelionangle unitAngular distance (measured in the plane of the object's orbit and in the direction of its motion) from the ascending node to the perihelion point.ωosculating elementto define the size, shape, and orientation of an orbit in spacelongitude of the perihelion angle

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