Brihat Parashara Hora Shastra
अत्मा सूर्यादिखेटानां मध्ये ह्यंशाधिको ग्रहः । अंशसाम्ये कलाधिक्यात् तत्साम्ये विकलाधिकः ॥ ३॥
Atma Karak Defined. Among the Grahas from Sūrya etc. whichever has traversed maximum number of degrees in a particular Rāśi is called Atma Karak.
english translation
atmA sUryAdikheTAnAM madhye hyaMzAdhiko grahaH । aMzasAmye kalAdhikyAt tatsAmye vikalAdhikaH ॥ 3॥
hk transliteration by Sanscript