It is never completely possible to be sure about why certain historical events happened. This is particularly true when the events are intellectual events like the Scientific Revolution. It is not possible to know for certain why people started to think in these new ways. That said, there are a number of factors that historians point to as causes of this “revolution.” Some of these factors include:
Reformation. With the Protestant Reformation, the idea that the Roman Catholic Church had a monopoly on the truth disappeared. This helped to allow people to start thinking about things in scientific ways rather than depending on the Church to tell them what the truth was.
Knowledge of Greek. In the time before the Scientific Revolution, scholars mastered Greek. This made it clear that there were ancient thinkers who had questioned the thinkers like Aristotle whose works were unquestioned in medieval times.
Renaissance art. Artists during this time started to pay much more attention to things like human anatomy and the natural world. This put more of an emphasis on scientific observation. That helped lead to the promotion of science.
Invention of new instruments. With the invention of things like the telescope and microscope, it became possible to observe things that could not be observed before. This helped make it clear that there were things that previous theories could not account for.
These are some of the most important factors that are generally said to have caused the Scientific Revolution to occur.