This is a one semester introduction to astronomy I started teaching in Bilkent University
as of 2016-2017 Fall Semester. In this course we will discuss the celestial spheres, coordinate systems frequently used in astronomy, motions of the celestial bodies, the laws of physics describing these motions, the nature of light, optics and telescopes, the nature and the evolution of stars, our galaxy and other galaxies in the universe, the birth and evolution of the universe, and the search for extraterrestrial life. This course is intended for physical science and engineering majors. A student of this course should understand our place in the cosmos in terms of both our cosmic address and the evolutionary processes that have shaped the universe we live in. It is aimed to explain not only what we know about the universe and the celestial bodies, but also how we know what we know about them.