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 body when viewed from two different points. Geocentric parallax is the angle between the direction of the body as seen from the surface of the earth and the direction in which it appears from the centre of the earth. Annual parallax is the angle between the direction in which a 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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