Definition of Paralax
Parallax, an astronomical term to denote an apparent change in the
position of a heavenly body due to a change in the position or assumed
position of the observer.
- Wikipedia
Par"al*lax (?), n. [Gr. &?; alternation,
the mutual inclination of two lines forming an angle, fr. &?; to
change a little, go aside, deviate; para` beside, beyond +
&?; to change: cf. F. parallaxe. Cf. Parallel.]
1. The apparent displacement, or difference of
position, of an object, as seen from two different stations, or points
of view.
2. (Astron.) The apparent difference in
position of a body (as the sun, or a star) as seen from some point on
the earth's surface, and as seen from some other conventional point,
as the earth's center or the sun.
Annual parallax, the greatest value of the
heliocentric parallax, or the greatest annual apparent change of place
of a body as seen from the earth and sun; as, the annual
parallax of a fixed star. -- Binocular
parallax, the apparent difference in position of an
object as seen separately by one eye, and then by the other, the head
remaining unmoved. -- Diurnal, or
Geocentric, parallax, the
parallax of a body with reference to the earth's center. This is the
kind of parallax that is generally understood when the term is used
without qualification. -- Heliocentric
parallax, the parallax of a body with reference to the
sun, or the angle subtended at the body by lines drawn from it to the
earth and sun; as, the heliocentric parallax of a planet.
-- Horizontal parallax, the geocentric parallx
of a heavenly body when in the horizon, or the angle subtended at the
body by the earth's radius. -- Optical
parallax, the apparent displacement in position
undergone by an object when viewed by either eye singly.
Brande & C. -- Parallax of the cross
wires (of an optical instrument), their apparent
displacement when the eye changes its position, caused by their not
being exactly in the focus of the object glass. --
Stellar parallax, the annual parallax of a fixed
star.
- Webster's Unabridged Dictionary (1913)
- The change of angular position of two stationary points relative to each other as seen by an observer, due to the motion of an observer
- The apparent shift of an object against a background due to a change in observer position
- The Nuttall Encyclopedia
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