Whatever effect is declared in the Rasi chart must be verified in the Navamsha (D9); a planet strong in Navamsha, even if weak in Rasi, yields full fulfillment of its indications.
svarāśinavamāṁsthō vargottama ucyate | sa eva balavān grahaḥ svabhāvaphalaṁ vrajet ||
A planet occupying the same sign in both the rasi chart and the navamsa is called vargottama; he alone is counted supremely strong and delivers his natural fruit undiluted. Whatever house he owns or occupies flourishes under his doubled dignity.
Verse 3 — Debilitated in Sign, Exalted in Navamsa — Late Triumph
Should a planet stand debilitated in the sign yet exalted in his navamsa, he meets struggle at the outset of matters but ultimately secures the highest good. Early effort appears wasted, yet the navamsa seed ripens into success as life matures.
Verse 4 — Exalted in Sign, Debilitated in Navamsa — Fading Promise
A planet resplendent in exaltation in the sign yet fallen in his navamsa shines first and slackens afterwards: early glory, early gains, then a gradual thinning of the same fortune. The outward promise is real but its foundation is shallow.
Verse 5 — A Planet Transmits Both Its Rasi House and Navamsa House
A planet dispenses fruit in two streams — from the house he occupies in the rasi chart and from the house corresponding to his navamsa sign counted from the ascendant. Both currents are to be weighed together, for they do not contradict but complete one another.
Verse 6 — The Lord in His Own Navamsa Guards the House Lifelong
स्वनवांशगतो भावं यो रक्षति स ईश्वरः । न क्षयो नास्ति हानिश्च यावज्जीवममुं विभोः ॥
svanavāṁśagato bhāvaṁ yo rakṣati sa īśvaraḥ | na kṣayo nāsti hāniś ca yāvajjīvam amuṁ vibhoḥ ||
A house-lord seated in his own navamsa is a guardian deity to that house: so long as he lives in the chart, that domain suffers neither ruin nor lasting loss. Transits may shake it, but the lord restores what is his own.
The planet occupying a house yields its first results at the beginning of matters, while the house-lord sustains them for long. When the occupant is weak but the lord strong, early promise seems dim yet the house endures and matures; the reverse pairing burns bright and brief.
Verse 8 — Trines from the Navamsa Lagna Hold the Fortune Reservoir
navāṁśalagnatrikoṇaṁ daivabalam udīritam | tatra sthā grahaśaktir yā jīvane śubhaṁ vahet ||
The trines counted from the navamsa lagna are declared the reservoir of fortune; the strength of planets standing in those three signs carries auspiciousness through the whole life. Whatever the rasi chart promises, its delivery is metered out through these navamsa trines.
Verse 9 — Exchange Between Two Lords Enriches Both Houses
By the yoga of exchange, when each of two lords sits in the other's house, both houses become richly prosperous: each lord, dwelling in his counterpart's home, fills it with his own fruit. The bond makes the two domains inseparable — they rise or fall together.
Verse 10 — Lord Weak in Both Vargas Starves the House
dvayor api nicasthatve bhāvahānir na saṁśayaḥ | śubhadṛṣṭisamāyāte krameṇaiva phalaṁ śubham ||
When the house-lord is debilitated in both the rasi and the navamsa, loss to that house admits no doubt; yet should a benefic aspect reach him, the fruit returns step by step. The double fall marks the wound, the benefic glance marks the cure.