conjunction
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A conjunction is when two objects in space—like planets or stars—line up so they appear in the same direction from Earth. Astronomers track these events because they're useful for navigation, scientific observation, and understanding how celestial objects move across our sky.
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Visual conjunction between the Moon and the planet Venus, the two brightest objects in the night sky In astronomy, a conjunction occurs when two astronomical objects or spacecraft appear to be close to each other in the sky. This means they have either the same right ascension or the same ecliptic longitude, usually as observed from Earth.
When two objects always appear close to the ecliptic—such as two planets, the Moon and a planet, or the Sun and a planet—this fact implies an apparent close approach between the objects as seen in the sky. A related word, appulse, is the minimum apparent separation in the sky of two astronomical objects.