Th is book grew out of my 80- student general astronomy course, which I’ve taught for 20 years and whose variety of primary textbooks always glossed over special relativity and general relativity while trying to explain the cosmology that is based on those subjects. Most of my students have been juniors and seniors who are desperate to get their science requirement fulfi lled, hoping for as little math as possible. Over the years, I learned to translate the mathematical equations conventional relativity texts rely on into pictures that are readily understood and contain within them the mathematical essentials. Th is book provides the comprehensive coverage needed to understand, in suffi cient depth, these three linked areas of our reality. It may be useful in other courses, such as Physics for Poets, Learning Science Th rough Science Fiction, and Natural Science Inquiry. Th ough one seldom gets physics majors in such courses, a number of those who have taken them have remarked that they never really understood relativity before learning anew in this pictorial form. So this material likely has a place in a modern physics course as well. Readers seeking this knowledge on their own may also fi nd it helpful.