Astrophysics is Easy! / The Patrick Moore Practical Astronomy Series (PDF)

From the reviews:

"Inglis … offers a handy, useful resource both for amateur astronomers and colleges with small student-oriented observatories. It will be useful for introductory astronomy courses that include some observations. … Many different kinds of stars are discussed with the appropriate physics. In addition, Inglis treats topics such as different kinds of galaxies, gravitational lensing, and Hubble’s Law, all done using mathematics no more sophisticated than arithmetic. For all good college libraries. Summing Up: Highly recommended. General readers; lower-division undergraduates; two-year technical program students." (K. L. Schick, CHOICE, Vol. 45 (6), 2006)

"Inglis begins by discussing all the fundamental tools of the trade and then moves on to the astrophysics of the interstellar medium stars, and finally galaxies. The text’s tone is friendly and conversational, and the author sprinkles in his own anecdotal experiences. The book is generously illustrated with black-and-white figures and a few color photographs. … Astrophysics Is Easy! is a must for any amateur astronomer who desires to learn more about the science of astronomy … ." (Jennifer Birriel, Sky and Telescope, May, 2008)

"The author has set himself the goal of writing a book that is useful to the amateur astronomer who wants to know more about the beauty in the sky … . this book is affordable for many young scientists, physicists, or amateur astronomy groups. It will also be useful to professional astrophysicists who have to address a broad audience or prepare a lecture for a non-scientific public. … this book may encourage more young readers to pursue a career in science, maybe even in astrophysics." (Fernande Grandjean and Gary J. Long, Physicalia Magazine, Vol. 30 (4), 2008)