The Fundamentals of Astronomy module in high school Geography Elective 1 is closely linked to Compulsory 1: Fundamentals of Earth Science and Selective Compulsory 1: Fundamentals of Physical Geography. It covers three fundamental levels—the Earth-Moon system, the Solar System, and the Galaxy-Universe—with a focus on astronomical observation methods and conceptual understanding. This paper analyzes the module’s structure, its interdisciplinary connections, and its role in fostering scientific literacy. The cosmology conveyed in this module consists of three key aspects: the scientific foundation of cosmology, the spatiotemporal perspective, and the harmony between humanity and nature. The paper further emphasizes three educational objectives: guiding students to respect nature and others, rejecting superstition in favor of scientific reasoning, and developing a reflective and positive outlook on life. By integrating astronomical concepts into geography education, the module enhances students’ comprehension of cosmic phenomena while promoting critical thinking and broader scientific awareness.