Surya Siddhanta
रोहिण्यादित्यमूलानाम् प्राची सार्पस्य चैव हि। यथा प्रत्यवशेषाणाम् स्थूला स्याद् योगतारका॥
Of Rohini, Punarvasu (aditya), and Mula, it is the eastern, and so also of Aslesha (sdrpa) : in the case of each of the others, the junction-star (yogataraka) is the great (sthula) one.
english translation
rohiNyAdityamUlAnAm prAcI sArpasya caiva hi। yathA pratyavazeSANAm sthUlA syAd yogatArakA॥
hk transliteration by Sanscript