For Copernicus, I think it was On the Revolution of the Celestial Spheres. I think For Newton it was Philosophiæ Naturalis Principia Mathematica.
The Christianity<span> that was </span>spread<span> across Europe </span>during the middle ages<span> was based on the scriptures that recounted the life of the Christ and his disciples. The rise of</span>Christianity during<span> the Roman Empire was seen as a threat against the Empire. ... The Christian Church had its own lands, laws and taxes
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Sources such as diaries though not very reliable can be used if there are a large amount of them showing the same date and event. Historical books written about the event especially those closer to the time would be able to help determine that the date is accurate as well.
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