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Is called quadrature, in astronomy, to a particular astronomical position of a planet or the Moon, seen from Earth, which is achieved when one of these bodies is 90 degrees from the Sun.
There are two, an eastern square and a western square. During the quadratures the planet presents a minimal phase.
The Moon is in quadrature in the growing room) and in the waning room. In these positions the Moon forms with the Sun an angle of 90 degrees seen from the Earth. The moment of high lunar tide coincides with that of low solar tide, being the first most important. The result is that a smaller high tide occurs.
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