2 articles for "Radius Vector"

**Radius Vector**[Astro*Index]

A line drawn from the focus of an ellipse to an orbiting body; e.g. a line drawn from the Sun to a planet.

Kepler's second law states that even though planets speed up and slow down, the radius vector sweeps over equal areas in equal times.

See also:

♦ Kepler's Laws ♦ Ellipse

**Radius Vector**[Munkasey M.]

This is a line which gives the length and bearing ofan arrow of direction from the center of a sphere outwards.

See also:

♦ Ellipse

Astro*Index Copyright © 1997 Michael Erlewine