* Latin: Essential for accessing scholarly works and communication.
* Greek: Also important for accessing classical texts.
* Hebrew: He learned this later, partly driven by his theological interests.
* Rhetoric and Dialectic: Part of the standard arts curriculum, focusing on argumentation and persuasive speaking.
* Mathematics and Astronomy: These were his strongest subjects, and he received some advanced instruction in astronomy. However, opportunities for formal study in these areas were limited. He supplemented his formal education with independent study.
* Philosophy and Theology: These were significant parts of his education, shaping his worldview and influencing his approach to science.
It's important to note that Kepler's deep understanding of astronomy and mathematics came largely from self-study and intense personal dedication, beyond what his formal schooling alone could provide.