Cassini: what are your thoughts on why the Church formally adopted heliocentrism in 1822?
The Church did NOT formally adopt heliocentrism from 1822. What happened from 1741 was merely a dropping of all books treating of heliocentrism as a possible truth. They did this because the MAJORITY of the Holy Office believed heliocentrism was PROVEN CORRECT BY SCIENCE.
Accordingly, they went along with it and allowed any Tom, Dick or Harry to try to dismiss the 1616 decree. But not one pope dared address the decree because it was not reversible. Nevertheless, this act allowed Catholics to accept what the 1616 decree defined as formal heresy. Thankfully, the illusion left by those churchmen meant that in most cases the heresy is not intended and thus MATERIAL, with no guilt as a result.
This is a subject not yet resolved.