After the ritu becomes known, take the first part of the Drekkana as its first month and latter part as the next month of the ritu. Then from the expired amsas of the Drekkana, determine proportionately the tithi or the amsas of the Sun. The Istakala indicated by the amsas (degrees) of the Sun, will be the time of the birth of the querist. From the Istakala so calculated have to be worked out the longitudes of the planets and houses (Graha spast and Bhava spast). Predictions should then be made in accordance with the dispositions of the houses and planets.

तद्वशादिष्टकालो यो जन्मकालसमो हि सः । तत्र ग्रहांश्च भावांश्च ज्ञात्वा तस्य फलं वदेत्‌ । ।9।। पूर्व प्रकार से प्राप्त स्पष्ट सूर्य की राशि, अंश, कला के आधार पर जन्मसमय जानना सुगम है । अर्थात् वह सूर्यस्पष्ट जिस समय हो, वही जन्म समय होगा । जन्मसमयानुसार ग्रह व भाव स्पष्ट जानकर फल कहना चाहिए ।