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Quadrature

QUADRATURE (from Lat. quadratura, a making square), in astronomy, that aspect of a heavenly body in which it makes a right angle with the direction of the Sun; applied especially to the apparent position of a planet, or of the Moon at first and last quarters. In mathematics, quadrature is the determination of a square equal to the area of a curve or other figure.

Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)

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