Why are primary sources important when studying historical events ?

Primary sources are important when studying historical events, because they generally give eye-witness accounts of what is going on, albeit with opinions. They give historians a view of what a certain group of people think, the actions they take, and how the events affect their everyday lives. Primary sources also allow others to build on top of it, and to give 'parts of the "whole"', such as the pieces of a puzzle, to giving those in the future a more narrow and personal outlook of things.

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copernicus finished the first manuscript of his book, "de revolutionibus orbium coelestium" ("on the revolutions of the heavenly spheres") in 1532. in it, copernicus established that the planets orbited the sun rather than the earth. he laid out his model of the solar system and the path of the planets.