Phaladeepika
स्वात् सप्तांशदशांशकौ तु विषमे तु कामाच्छुभात् स्वादीशाश्च कलांशपा विधिहरीशार्कः समर्क्षेऽन्यथा । ख्यातैः कोणयुतैस्त्रिकोणभवनस्वर्क्षोच्चकेन्द्रोत्तमै- र्वर्गाः सप्त दश त्रयोदशमिता वर्गाः प्रदिष्टाः परैः ॥ ६॥
The Sapthamsas or the 4 th portions are in the case of an odd sign to be counted regularly from the sign itself, while in the case of an even sign they are to be reckoned from the 7 th onwards. In the case of an odd sign, the Dasamamsas or 16 th portions are to be counted from the sign itself; in the case of an even sign, from its 9 th onwards. The lords of the Shodasamsas or the fath sub-divisons in the case of an odd sign are those of the 12 signs reckoned from that sign onward and Brahma, Vishnu, Hara and Ravi. In the case of an even sign, this is reversed. The renowned or auspicious parts of great excellence arise from the several Vargas (Rasi, Hora, Drekkana, etc,) by the combination (of the special characteristics) of Trikona, Moolatrikonabhavana, Swakshetra, Swochcha, Kendra and Vargottama and number 7 in the case of the Saptha Vargas and 10 in the Dasa Vargas. Others reckon them as 13.
english translation
svAt saptAMzadazAMzakau tu viSame tu kAmAcchubhAt svAdIzAzca kalAMzapA vidhiharIzArkaH samarkSe'nyathA । khyAtaiH koNayutaistrikoNabhavanasvarkSoccakendrottamai- rvargAH sapta daza trayodazamitA vargAH pradiSTAH paraiH ॥ 6॥
hk transliteration by Sanscript