8/12/2023 0 Comments Parallax definition astronomy![]() To change a little, go aside, deviate beside, beyond – to change: cf. Alternation, the mutual inclination of two lines forming an angle, fr. Distance to an object using stereo vision-distance between your eyes (baseline) gives a shift in location of nearby objects, relative to distant objects. Stellar parallax, the annual parallax of a fixed star. 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. Optical parallax, the apparent displacement in position undergone by an object when viewed by either eye singly. 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. 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. This is the kind of parallax that is generally understood when the term is used without qualification. Diurnal, or Geocentric, parallax, the parallax of a body with reference to the earth’s center. ![]() 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. ![]() ![]() 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. (Science: astronomy) 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. The apparent displacement, or difference of position, of an object, as seen from two different stations, or points of view.Ģ. ![]()
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