David Mo
Philosopher
Yes it was! Remember, astronomers had been using a geocentric model (Ptomely's and derivations of it) since the Second Century CE for calculations, and the model worked.
There was also the problem of the lack of parallax with the stars under a heliocentric model. This problem was only resolved in the 19th C, 200 years after Galileo, when parallax with a star was finally observed. In Galileo's time, they didn't have the technology to prove this.
Well, simply list them then, showing that the reasons were accepted by the majority of scholars of the day. Start with the problems of parallax, and the that the geocentric model of the time worked. But show the reasons as acceptable solutions available in THEIR time, not solutions we have in hindsight 500 years later.
Some preliminary points:
1. The Church did not forbid the heliocentric theory because it was not scientifically true, but because it contradicted the Bible and its magisterium. This position was an effort to silence the science in some important matters. CraigB, Mcreal and myself have shown this three times at least. This is the main point in our debate but I don't know if you realise it.
2. The issue at the stake was not only the central position of the Earth in the universe, but the particular ecclesiastical theory that justified it with the Aristotelian physic and astronomy that included theories about the natural places, sublunary and superlunary worlds, perfection of the orbits and so on. Galileo's theories and observations had demolished some of those basic assumptions. (Kepler, also). Satellites of Jupiter, phases of Venus, etc.
3. What scientific consensus? The Church didn't control only the judiciary system (Inquisition) but the intellectual institutions also. Institutional "scientists" were priests or scholars of religious universities. And you can add to this consensus the fear to the Holy Inquisition. What a pretty scientific consensus you invoke!
4. But Galileo's theories quickly received another consensus: that of the independent scientists. This success cannot be explained without take in consideration the weakness of the geocentrical objections, the problems of this theory and the rapid confirmation of Galileo's theories in the places of Europe far of Church's arm. If you agree with these points we can pass to the arguments against geocentrism.
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What I am arguing is that heliocentrism was thought to have problems that could not be solved based on the knowledge of the time, which is why it wasn't accepted as proven until a century or so later.