Online Encyclopedia

PARALLAX (Gr. aapa?X6, alternately)

Online Encyclopedia
Originally appearing in Volume V20, Page 760 of the 1911 Encyclopedia Britannica.
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PARALLAX (Gr. aapa?X6, alternately)  , in astronomy, the apparent change in the direction of a heavenly
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body when viewed from two different points .
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Geocentric parallax is the angle between the direction of the body as seen from the
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surface of the earth and the direction in which it appears from the centre of the earth .
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Annual parallax is the angle between the direction in which a
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star appears from the earth and the 1 direction in which it appears from the centre of the sun . For stellar parallaxes see STAR; the solar parallax is discussed below .

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