Jataka Tattva · by Mahadeva
Chapter 17 · Planet Periods
दशातत्वम्
लग्नदशा चरभेऽङ्गे द्रेष्काणक्रमाच्छ्रेष्ठा मध्याऽधमा द्विस्वभावे व्यत्ययेन स्थिरे नेष्टेष्टसमा ।
The dasha (planet period) of the lagna (rising sign) goes by its drekkana (one-third part of a sign). If the lagna is a moving sign, the 1st, 2nd and 3rd drekkana give best, middling and lowest, in order. If it is a dual sign, the order is reversed. If it is a fixed sign, they give bad, good and middling, in order.
वक्रगस्य पाके स्थानमानसौख्याद्यपचयः ।
In the dasha (planet period) of a retrograde planet, a person's place, honour, comfort and the like decline.
त्रिकेतरस्य पाकेऽभीष्टसिद्धिः ।
Say a planet is not in the trika (group of three houses), the 6th, 8th or 12th. In its dasha (planet period), wishes come true.
भाङ्गेशरिपुपाके बुद्धिभ्रंशो राजभयं च ।
In the dasha (planet period) of an enemy of the lagna (rising sign) lord, the mind goes astray. There is also fear from the king.