Jataka Tattva 6.37

लग्ने शुक्रे पूर्वार्द्धे सुखी ।

Say Venus is in the lagna (rising sign). Then the person is happy in the first half [of life].

शुभर्क्षेऽङ्गेशे शुभेक्षिते वा गोपुरे त्रिपादात्परं सुखी ।

Say the lord of the lagna (rising sign) is in a good planet's sign. Good planets aspect it, or it is in gopura amsha (a good rank of strength). Then…

लग्नेशे चापे वा लग्नेशांशपे वा तथा स्थिते लाभेशे विंशतिवर्षेभ्यः परं सुखी ।

Say the lord of the lagna (rising sign) is in Sagittarius. Or say the lord of its navamsha (one-ninth part of a sign) is there. The 11th lord is…