1911 Encyclopædia Britannica/Quadrature
|←Quadratrix||1911 Encyclopædia Britannica, Volume 22
|See also Quadrature on Wikipedia; and our 1911 Encyclopædia Britannica disclaimer.|
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.