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The Epic Interactive Encyclopedia 1997
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conjunction
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1992-09-02
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In astronomy, the alignment of two celestial
bodies so that they have the same position as
seen from Earth. Inferior conjunction occurs
when an inferior planet (or other object)
passes between the Earth and Sun, and has an
identical right ascension to the Sun.
Superior conjunction occurs when a superior
planet (or other object) passes behind, or on
the far side of, the Sun, and has the same
right ascension as the Sun. Planetary
conjunction takes place when a planet is
closely aligned with another celestial
object, such as the Moon, a star, or another
planet, as seen from Earth. Because the
orbital planes of the inferior planets are
tilted with respect to the Earth, an inferior
planet usually passes either above or below
the Sun as seen from Earth. If they line up
exactly, a transit will occur.