Jataka Tattva · by Mahadeva
Chapter 17 · Planet Periods
दशातत्वम्
त्रिकेतरस्थे सबले चन्द्रे दशा श्रेष्ठा ।
Say the Moon is strong and is not in the trika (group of three houses), the 6th, 8th or 12th. Then the dasha (planet period) is best.
मुख्यदशेशोच्चमित्रस्वभस्थः सन् दशेशाधिष्ठितराशित उपचयत्रिकोणास्तगश्चेच्चन्द्रः शुभफलदोऽन्यथा नेष्टः ।
Say the Moon is in the uchcha (high point) sign of the main dasha (planet period) lord. Or in a friend's sign of that lord, or in its own sign. And…
चन्द्राधिष्ठितो राशिर्जन्मनि यद्भावगस्तद्भावोत्थं शुभमशुभं वा ज्ञेयम् ।
In the birth chart, take the sign the Moon holds [at the start of the dasha (planet period)]. Find which house of the birth chart that sign falls…
रिपुयुक्पापस्य पापदशान्तरे विपत् ।
Say a bad planet is joined with an enemy planet. In that bad planet's dasha (planet period) or sub-period, disaster comes.