I am not sure which of his books you are asking us about, since he wrote at least three of them. But his best known was On the Revolutions of the Celestial Spheres (in Latin,
De revolutionibus orbium coelestium). Nicolaus Copernicus was an astronomer, and this book taught something entirely new for the 1500s-- that the planets revolved around the sun.
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Nicholas Copernicus was afraid that no one would accept his theory so he did not release his book until the year of his death. Many say that he died with his book in his hands on his death bed.
Copernicus was employed by the Church and was reluctant to publish work that contradicted the scriptures. Publication of his book was delayed until the year he died, 1543.
Copernicus' parents were Nicolaus Koppernigk - of which 'Copernicus' is the Latin form - and Barbara (Watzenrode).
what did nicolaus Copernicus obstacles
because he did not want to be embarresed by the Roman Catholic church because they might (and did) reject his theory