Search:radius vector -> RADIUS VECTOR
radius vector
r a d i u s v e c t o r hex:#114;#97;#100;#105;#117;#115;#32;#118;#101;#99;#116;#111;#114;
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- Radius vector - - A straight line (or the length of such line) connecting any point, as of a curve, with a fixed point, or pole, round which the straight line turns, and to which it serves to refer the successive points of a curve, in a system of polar coordinates. See Coordinate, n.
- Radius vector - n. - An ideal straight line joining the center of an attracting body with that of a body describing an orbit around it, as a line joining the sun and a planet or comet, or a planet and its satellite.
- Apsis - n. - In a curve referred to polar coordinates, any point for which the radius vector is a maximum or minimum.
- Lituus - n. - A spiral whose polar equation is r2/ = a; that is, a curve the square of whose radius vector varies inversely as the angle which the radius vector makes with a given line.