T-Square = two planets about 180° apart plus a third about 90° from both. Rahu–Ketu count as the opposition pair.
Graha positions
Find next event
Mutual-exchange, conjunction and opposition events involve two planets, so ticking one planet lists every event where it is one of the pair. Tick a second planet to see only that pair. Tick three or more to see every pairwise event among them; for Conjunction a second list shows when all of them are together in one sign. A T-Square lists those that include all ticked planets.
