Classical source
Brihat Samhitaबृहत्संहिता
Varahamihira’s encyclopaedic samhita
Brihat Samhita is not only a birth-chart book. It ranges across astronomy, calendar practice, transits, gems, architecture, weather, natural signs, public affairs, and the customs of its period. That breadth makes it useful, but it also means the whole book cannot be poured into a modern report.
SahiKundli checked the 1946 Bangalore edition translated by Panditabhushana V. Subrahmanya Sastri and Vidwan M. Ramakrishna Bhat. Chapter numbers are always tied to that edition. A second digital edition in the Chidambaram Iyer lineage divides the work into parts and numbers some chapters differently, so it is used only as a cross-check after the chapter is mapped.
Where it helps SahiKundli
Chapter 69: Pancha Mahapurusha
A second classical witness for Ruchaka, Bhadra, Hamsa, Malavya, and Sasa. BPHS and Phaladeepika also preserve this doctrine.
Chapter 80-83: Gem examination
The currently active report use: historical quality observations for Diamond, Pearl, Ruby, and Emerald in SahiRatna.
Chapter 98 and 100: Nakshatra and karana
Classical activity descriptions that help explain the almanac. The astronomical value is still computed independently.
Chapter 104: Planetary transits
A traditional Moon-sign gochar frame. It is reference material, not a licence for guaranteed event predictions.
In SahiRatna, Phaladeepika 2.29 remains the source for the nine-graha gemstone mapping. Brihat Samhita adds something different: quality vocabulary. Chapters 80-83 discuss visible features such as lustre, brightness, sound form, scratches, dullness, bubbles, and split points. These observations sit beside modern buyer guidance. They never replace an independent laboratory report, treatment disclosure, or certification.
What is deliberately excluded
The text also contains lifespan statements, death language, caste rules, gender hierarchy, fear-based gem consequences, disaster omens, and royal or feudal claims. These do not enter SahiKundli reports. A useful verse is admitted passage by passage; a useful chapter is never treated as blanket permission to publish everything around it.
A citation shows where a traditional statement comes from. The chart or Panchanga value is computed first. The cited text helps explain the traditional frame after the calculation is known. See how SahiKundli cites sources for the full rule.