You searched for: “conjunction”
conjunction (s) (noun), conjunctions (pl)
1. The alignment of two celestial bodies as seen from Earth.

A "superior planet", or other object, is in conjunction when it lies behind the Sun.

An "inferior planet", or other object, comes to inferior conjunction when it passes between the Earth and the Sun.

It is at "superior conjunction" when it passes behind 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.

2. The lining up of two celestial bodies so they lie in the same direction as seen from Earth.

Superior conjunction occurs when a planet lies on the other side of the Sun from the Earth.

Inferior conjunction occurs when a planet lies on the line joining the Sun and the Earth, and is closer to the Earth.

This entry is located in the following unit: Astronomy and related astronomical terms (page 7)
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conjunction (s), conjunctions (pl)
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inferior planet conjunction (s) (noun), inferior planet conjunctions (pl)
The celestial alignment of a planet passing between the Earth and the Sun: When Mercury or Venus lies between the Earth and the Sun, an inferior planet conjunction occurs.
This entry is located in the following unit: Astronomy and related astronomical terms (page 13)
planetary conjunction (s) (noun), planetary conjunctions (pl)
The situation when two or more planets look as if they are very close together, but in reality they are far apart from each other: A planetary conjunction takes place when a planet is closely aligned with another celestial object, such as the moon, a star, or another planet.
This entry is located in the following unit: Astronomy and related astronomical terms (page 19)
superior planet conjunction (s) (noun), superior planet conjunctions (pl)
The alignment of two celestial bodies when they lie or pass behind the sun: A superior planet conjunction takes place when planets, like Jupiter, have orbits larger or greater than the Earth's orbit, and are on the other side of the Sun from the Earth in which all objects are arranged in a straight line.
This entry is located in the following unit: Astronomy and related astronomical terms (page 25)