That planet which has advanced the greatest number of degrees becomes the supreme significator (Atmakaraka); it yields the fruits of the self and destroys great sins.
Verse 2 — Seven or Eight Chara Karakas: The Two Schools
Among the planets from Surya onward, the one with the highest degrees is Atma (the self); if degrees are equal, the higher kalas decide; if still equal, the higher vikalas.
Verse 5 — Mercury Never Atmakaraka; Rahu Reverse-Degrees
By excess of sign-and-degree Mercury is not taken as Atmakaraka; the planet with more amshas becomes the karaka while the lowest becomes the last (Dara) karaka.