1. Noun. A line connecting a satellite to the center of the body around which it is rotating.

Generic synonyms: Vector

2. Noun. A line connecting a point in space to the origin of a polar coordinate system.
Generic synonyms: Vector

1. 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.

1. Noun. (mathematics) 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. ¹

2. Noun. (astronomy) 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. ¹

¹ Source: wiktionary.com

1. 1. 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. 2. 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. Source: Websters Dictionary (01 Mar 1998)

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Below you will find example usage of this term as found in modern and/or classical literature:

1. A Treatise on the Analytic Geometry of Three Dimensions by George Salmon (1882)
"If 8 be the angle which the perpendicular on the tangent plane makes with the radius vector, we have P= p cos 6; but we have, in the last article, ..."

2. A Treatise on the Analytic Geometry of Three Dimensions by George Salmon (1882)
"The expression tan# = — leads to a construction for the perpendiculars on the tangent planes at the points where a given radius vector meets the two sheets ..."

3. A Treatise on the Analytic Geometry of Three Dimensions by George Salmon (1874)
"We have therefore »* »* Whence tan*0 = - In this form the expression is analogous to the value for the angle between the normal and central radius vector of ..."

4. A Treatise on the Analytic Geometry of Three Dimensions by George Salmon (1865)
"If 6 be the angle which the perpendicular on the tangent plane makes with the radius vector, we have P=p cos#; but we have in the last article proved P" = f ..."

5. A Treatise on the Analytic Geometry of Three Dimensions by George Salmon (1862)
"If 0 be the angle which the perpendicular on the tangent plane makes with the radius vector, we have P= p cos6; but we have in the last article proved P* ..."

6. Penny Cyclopaedia of the Society for the Diffusion of Useful Knowledge by Charles Knight (1838)
"With regard to the disturbing force perpendicular to the radius vector: if AC is ... I. As the disturbing force, in the direction of the radius vector, ..."

7. The Encyclopaedia Britannica: A Dictionary of Arts, Sciences, and General by Thomas Spencer Baynes (1888)
"This is commonly expressed by saying that the radius- vector describes equal areas in equal times about the point to which the acceleration is directed. ..."

8. Elements of the Differential and Integral Calculus by William Anthony Granville, Percey Franklyn Smith (1904)
"Angle between the radius vector drawn to a point on a curve and the tangent to the curve at that point. Let the equation of curve in polar coordinates be p ..."