🔬 Discovery

Nilakantha's planetary model (Tantrasangraha)

Modelo planetario de Nilakantha (Tantrasangraha)

Date
1501 · confidence high
Place
Trikkandiyur, Tirur, Malappuram, Kerala, India
Credited to
Nilakantha Somayaji
People
👤 Nilakantha Somayaji1444–1544
Field
Cosmos & Earth

⚠️ Disputed: the sources disagree.

What was discovered

Revision of the planetary model in which Mercury and Venus orbit the Sun and the Sun orbits the Earth, which corrected the equations of the centre for the inner planets. It is a geo-heliocentric scheme similar to the one Tycho Brahe proposed in 1588.

The geo-heliocentric reading is by K. Ramasubramanian and colleagues (1994) and is accepted by many, though not all, historians.

What it led to

  • better predictions for Mercury and Venus
  • commentaries and proofs from the Kerala school (Yuktibhasa)
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Sources✓ verified 2026-09-25