Haribol,
You are correct..according to vedic cosmology the sun revolves around the sun..
There is nothing wrong with this conception and scientifically correct.. it is a matter of choosing a convention and a suitable coordinate system..
both the conceptions (sun revolving arond earth and earth revolving around sun) are scientifically correct as it is about relativity..
For more details check the following video in youtube (i am not being able to post the link here)
1. Vedic Cosmology Part 2 of 6
2. Vedic Cosmology Part 3 of 6
Hope this helps..