Conjunction

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Conjunction

1. The situation of two celestial bodies having either the same celestial longitude or the same sidereal hour angle. Compare opposition, quadrature.
A planet is at superior conjunction if the sun is between it and the earth; at inferior conjunction if it is between the sun and the earth.
2. The time at which conjunction, as defined in sense 1, takes place.

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use