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How Jyotish quantifies planetary power through positional, directional, temporal, motional, natural, and aspectual strength into a single composite score
Shadbala (“six strengths”) is the most comprehensive system in Vedic astrology for quantifying how powerful a planet truly is. A planet may sit in exaltation yet be combust, or occupy its own sign yet languish in a dusthana house. Shadbala resolves these contradictions by computing six independent measurements and summing them into a single composite score measured in shashtiamsas (sixtieths of a rupa).
The six components are: Sthana Bala (positional) with 5 sub-parts — Uccha (exaltation), Saptavargaja (7 divisional charts), Ojha-Yugma (odd/even sign), Kendradi (angular placement), Drekkana (decanate). Dig Bala (directional) — Jupiter/Mercury strongest in the East (lagna), Sun/Mars in the South (10th), Saturn in the West (7th), Moon/Venus in the North (4th). Kala Bala (temporal) — day/night rulership, hora lord, month/year lords. Cheshta Bala (motional) — retrograde planets gain maximum strength. Naisargika Bala (natural) — fixed values, Sun strongest, Saturn weakest. Drig Bala (aspectual) — benefic aspects add, malefic aspects subtract.
Shadbala originates from Parashara’s Brihat Parashara Hora Shastra (BPHS), chapters 27-30, where Maharishi Parashara systematically defines each strength component. The system was later refined by Varahamihira in Brihat Jataka and by Nilakantha in Tajika Neelakanthi. The mathematical precision of Shadbala reflects the empirical astronomical tradition of ancient Indian scholars who sought to move beyond subjective judgment to measurable planetary potency.