> ............... based on the well known fact that the earth is
> a flat disk. After all billions of people thought that for thousands of
> years, all over this planet, no ?

No. Or at least, not essentially so.
The knowledge that the earth was a sphere and the proof of it and the
measurement of the size was made well before Christ's time. And the
measurement was reasonably accurate. Refusal to apply available knowledge
for reasons of special interest was, as it often is now, a major part of the
problem.



        RM

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