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quadrature |
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quadrature, in astronomy, arrangement of two celestial bodies at right angles to each other as viewed from a reference point. If the reference point is the earth and the sun is one of the bodies, a planet is in quadrature when its elongation elongation, in astronomy, the angular distance between two points in the sky as measured from a third point. The elongation of a planet is usually measured as the angular distance from the sun to the planet as measured from the earth.
..... Click the link for more information. is 90°. As viewed from the earth, the half-moon is in quadrature to the sun. The inferior planets (Mercury and Venus) never reach quadrature; the superior planets each have two points of quadrature in their orbits. quadrature [′kwä·drə·chər] (astronomy) The right-angle physical alignment of the sun, moon, and earth. (mathematics) The construction of a square whose area is equal to that of a given surface. The process of calculating a definite integral. (physics) State of being separated in phase by 90°, or one quarter-cycle. Also known as phase quadrature. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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