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Facts & lineage · history
“Vedic” is not one date
Jyotisha has an early calendrical layer, a later horoscopic layer and modern popularisations. Calling all three unchanged knowledge from the Vedas removes the history that makes them intelligible.
Three layers that should not be collapsed
- Vedanga Jyotisha is calendrical astronomy concerned with timing ritual and organising the lunisolar calendar. It is not a twelve-sign natal manual.
- Classical horoscopy developed later through exchange among Greek, Mesopotamian and Indian astronomical traditions. The Brihat Jataka is an Indian work, and its chapter-one zodiac also preserves traces of that transmission.
- Modern sun-sign publishing can borrow Sanskrit names without thereby becoming evidence for either earlier layer.
The book this phase rejected
The Hindu Book of Astrology, New York, 1902
The title made it look like an obvious Vedic source. Reading it changed the decision: it is an American esoteric popularisation built around fixed tropical sun-sign dates. It remains in the research log, but no rashi field or claim is allowed to cite it.
What Bodhastra calls this section
The navigation says Vedic because that is the term readers recognise. The pages say Jyotisha when naming the tradition, identify the particular textual layer behind each claim, and avoid claiming that the twelve-sign horoscope is simply present, unchanged, in the Vedas.