I wrote about this two years ago.
There are many temples in India devoted to deities representing the Sun, moon and the planets in India. Most of them do contain a visual representation of the Solar system, with the Sun at the centre. All other deities surround the sun. The individual deities face random directions, possibly illustrating the concept that each rotates independently around its own axis. There is no deity representing the earth, showing that the builders did not have the concept of the earth being yet another planet.
Do the Navagraha models indicate that there was a wide spread heliocentric concept before Copernicus formulated it as a theory? Or is the central placement of the Sun God only a way of showing his relative importance?
I found some information relevant to the whole question, when I ran into a book published in India in 2005:
Navagraha Temples of Tamil Nadu Kaveri Delta
by Padma Raghavan and Savita Narayan,
ISBN No: 81-89066-22-6, Published in 2005
English Edition Publishers and Distributors (India) Pvt. Ltd.
5/10, 11, 105 Jogani Industrial Complex, V. N. Purav Marg, (Near ATI) Chunabhatti, Mumbai 400022
The book describes fourteen temples, each devoted to a single deity. The deities involved are Sun and moon, five visually dominant planets, and Rahu and Ketu representing places along the Sun's apparent path in the sky where eclipses occur.
Based on the compositions by the Nayanmars which mention them, the authors believe that the temples were in existence in the 7th Century A. D. They say that there is evidence that the Suryanar (the Sun God) Temple near Kumbakonam was built in 1100 A. D.