Editing Triple conjunction (section)

{{short description|Astronomical event of two planets, or a planet and a star passing three times in a short period}}
{{Unreferenced|date=April 2013}}

A '''triple conjunction''' is an astronomical event when two [[planet]]s or a planet and a [[star]] appear to meet each other three times during a brief period, either in [[opposition (astronomy)|opposition]] or at the time of [[inferior conjunction]], if an [[inferior planet]] is involved. The visible movement of the planet or the planets in the sky appears therefore normally [[retrograde and prograde motion|prograde]] at the first conjunction, [[apparent retrograde motion|retrograde]] at the second conjunction, and again prograde at the third conjunction.

The lining-up of three planets is a particular case of [[syzygy (astronomy)|syzygy]].

There are three possible cases of triple conjunctions.