The essence
The word comes from the Latin coniunctio, a joining together. Greek astrologers called it a synodos, a meeting, and treated it as a bodily assembly of planets rather than an aspect cast across distance. In the sky, conjunct planets appear near each other along the ecliptic, sometimes close enough to share a single telescope view. When one of them is the Sun, the other disappears in its glare, a condition the ancients called combust. The best-known conjunction is the monthly meeting of Sun and Moon, which we call the New Moon. Medieval astrologers also tracked the Jupiter-Saturn conjunction, which returns about every 20 years, as a marker of historical change.
Symbolically, a conjunction is a seed being planted. Mars conjunct Venus does more than switch on both desire and drive. It creates a third thing, such as affection that acts or beauty with a competitive edge. There is no distance here, no stepping back to watch one planet affect the other. You live inside the blend. Traditional astrology treated the conjunction as the strongest testimony a planet could receive, for better or worse.



