Tuesday, September 14, 2004

Quadrature

In astronomy, that aspect of a heavenly body in which its direction as seen from the Earth makes a right angle with the direction of the Sun. The Moon at First or Last Quarter is said to be at east or west quadrature, respectively. A superior planet (outside the Earth's orbit) is at west quadrature when its position is 90� west of the Sun. It rises around midnight, reaches the meridian

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