The apparent angular motion across the sky of an object relative to the Solar System.

The apparent motion of a star across the sky (not including a star’s parallax), arising from the star’s velocity through space with respect to the Sun.

The apparent motion of a star across the sky (not including a star’s parallax), arising from the star’s velocity through space with respect to the Sun.

This is the shift of a star's (or other celestial object's) position across the celestial sphere. Proper motion is measured in units of arcseconds per year, ("/yr).

The actual movement of a heavenly body as dis­tinguished from a parallactic change in its position due to Earth's movement in space. Name is given, also, to Sun's apparent movement in Eclipt [..]

An instrument for measuring angles on a surface; an angular scale. In its most usual form it consists of a circle or part of one (usually a semicircle) graduated in degrees. See also COMPASS ROSE, THR [..]

Annual movement of a star across the sky.

The apparent motion of a star across the sky (not including a star’s parallax), arising from the star’s velocity through space with respect to the Sun.