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1. In physics, an apparent change in the position of an object when the person looking at the object changes position: Parallax was explained to Mr. Hill's students as the perceptible alteration of a chair, for example, when a person, who is looking at the chair, changes his or her position.
2. In astronomy, the angle between two imaginary lines from two different observation points meeting at a star: A parallax can apply to the angle between two fictitious lines from two different observation points meeting at a celestial body that is used to measure its distance from the Earth.
2. In astronomy, the angle between two imaginary lines from two different observation points meeting at a star: A parallax can apply to the angle between two fictitious lines from two different observation points meeting at a celestial body that is used to measure its distance from the Earth.
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“parallaxes”
The change in an astronomical object's apparent position: A geocentric parallax is caused by the change in the observer's earthly position because of the motion of the Earth during the day.
This entry is located in the following units:
centro-, centr-, centri-, kentro-
(page 7)
geo-, ge- +
(page 5)
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“parallaxes”
The change in the obvious position of an object against its background when observed from two different viewpoints: The parallax is an angular displacement undergone by the position of a star when observed from two different points.
In astronomy, nearby stars show a shift owing to a parallax when seen from different locations on the Earth's orbit around the Sun. A star's parallax is used to determine its distance from the Earth.
Nearer bodies, such as, the Moon, Sun, and planets also show a parallax caused by the motion of the Earth.
This entry is located in the following unit:
Astronomy and related astronomical terms
(page 18)
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“parallaxes”
The change in an astronomical object's apparent position caused by the change in the observer's position: A diurnal parallax is due to the motion or rotation of the planet Earth during the day:
This entry is located in the following unit:
Astronomy and related astronomical terms
(page 8)