Rupa Bhaty

Biography

Rupa Bhaty is an archaeoastronomer and architect whose research spans the Surya Siddhanta, the Indus Valley script, and the astronomical encoding of ancient Indian lore. Trained as an architect, Bhaty brings a spatial-analytical sensibility to textual and archaeological evidence. Her collaboration with Nilesh Oak on the Surya Siddhanta identified multiple update epochs embedded within the text — timestamps where specific astronomical parameters (pole star positions, Earth's obliquity, planetary periods) were simultaneously satisfied. This work demonstrates that the Surya Siddhanta is not a single-author document but a living astronomical handbook updated across millennia. Bhaty's independent contribution to archaeoastronomy centers on the star Agastya (Canopus). The Vedic and Puranic lore about sage Agastya crossing the Vindhya mountains encodes the astronomical phenomenon of Canopus becoming visible above the Vindhya range from northern India — an event she dates to 19,000–21,000 BCE based on the star's changing declination due to precession. Her most ambitious work is Deciphering the Indus Script (2025), which proposes that Indus Valley seals encode ancient place names using a Sanskrit-based phonetic system. If validated, this would resolve one of archaeology's great unsolved problems while establishing linguistic continuity between the Indus-Saraswati Civilization and the Vedic tradition. She has also argued that the Hora system (the 24-hour division of the day named after planetary bodies) and the weekday naming convention originated in India rather than in Hellenistic Babylon, based on internal evidence in the Surya Siddhanta. Her forthcoming works, Tale of Three Cities and The Agastya Code, promise to extend her research into new territory.

Methodology

Surya Siddhanta epoch analysis, IVC script research via ancient place-name encoding, Canopus pole position dating.

Key Claims

• 1Multiple Surya Siddhanta update epochs identified (with Oak)
• 2IVC seals encode ancient place names using Sanskrit-based phonetics
• 3Agastya-Vindhya lore dates to 19,000–21,000 BCE
• 4Hora/weekday naming system originated in India

Major Works

• •Ancient Updates to Surya-siddhanta (with Oak)
• •Deciphering the Indus Script (2025)
• •Tale of Three Cities (forthcoming)
• •The Agastya Code (forthcoming)