Word origin · etymology
Sanskrit compound: navāṃśa.
Nava means nine and aṃśa a portion; navāṃśa is a ninth division. D9 is the modern alphanumeric chart label.
Monier-Williams Sanskrit-English Dictionary: navāṃśa (University of Hyderabad) ↗
How we know · epistemology
Indian divisional mapping
A declared ninth-part rule converts rashi positions into navamsa signs. This produces a symbolic chart, not a second observed sky; interpretations require the intended Indian rules rather than assumptions imported from a generic ninth harmonic.
P. V. R. Narasimha Rao: Vedic Astrology, An Integrated Approach ↗
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