Brihat Parashara Hora Shastra
ततः पञ्चांशकाः प्रोक्तं त्रिकोणमपरे स्वभम्। चापे दशांशा जीवस्य त्रिकोणमपरे स्वभम्॥ ५३॥
the next 5 degrees Mooltrikon and the last 10 degrees are own Bhava. The first one third of Dhanu is the Mooltrikon of Guru, while the remaining part thereof is his own Bhava.
english translation
tataH paJcAMzakAH proktaM trikoNamapare svabham। cApe dazAMzA jIvasya trikoNamapare svabham॥ 53॥
hk transliteration by Sanscript