Brihat Jataka
लग्नत्रिकोणेषु गुरुस्त्रिभागैर्विकल्प्य वर्षाणि व्योऽनुमानात् ॥ ग्रीष्मोऽर्कलग्ने कथितास्तु शेषैरन्यायनर्तावृतुरर्कचारात् ॥ २६-२ ॥
Having ascertained the years from a guess of the age is Jupiter in the trikonas (1st to 4th, 5th to 8th, or 9th to 12th houses) from the lagna with the three portions (drekkanas), respectively. [The birth was in] the summer season when the lagna contains the Sun. But those described with those remaining when the season is in another ayana.
english translation
lagnatrikoNeSu gurustribhAgairvikalpya varSANi vyo'numAnAt ॥ grISmo'rkalagne kathitAstu zeSairanyAyanartAvRturarkacArAt ॥ 26-2 ॥
hk transliteration by Sanscript