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1A line of variable length drawn from a fixed origin to a curve.
‘When Archimedes defines a spiral, he gives fundamental properties connecting the length of the radius vector with the angles through which it has revolved.’
‘In fact, from the point P which is at distance d from the origin measured along a radius vector, the distance from P to the pole is d sec b.’
‘Three days later he wrote to Le Verrier asking the same question about the radius vector as he had asked Adams.’
‘The cylindrical coordinate system, (R, Z), was introduced for this boundary, where Z is the axis perpendicular to the plane passing through the boundary, and R is the two-dimensional radius vector in this plane.’
1.1Astronomy A line joining a satellite or other celestial object to its primary.
‘The radius vector from the sun to a planet sweeps over equal areas in equal times.’
‘The radius vector is shortest when the planet is at perihelion and longest at aphelion.’
‘In the second law, Kepler used the idea of radius vector, and stated that the radius vector from the sun to a planet sweeps out equal areas in equal intervals of time.’