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The alignment of two celestial bodies within the solar system so that they have the same longitude as seen from the earth. A planet that orbits between the sun and the earth (Venus and Mercury) is in superior conjunction when it is in line with the sun and the earth but on the opposite side of the sun to the earth. It is in inferior conjunction when it lies between the earth and the sun. Conjunction may also occur between two planets or a moon and a planet. Compare opposition.

Subjects: Astronomy and Astrophysics — Physics.

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