Kategoria BISAC: Science >> Space Science - Astronomy

The Foundations of Celestial Reckoning gives the reader direct access to the foundational documents of the tradition of calculation created by astronomers of the early Chinese empire between the late second century BCE and the third century CE. The paradigm they established was to shape East Asian thought and practice in the field of mathematical astronomy for centuries to come. It was in many ways radically different from better known traditions of astronomy in other parts of the ancient world.

This book includes full English translations of the first three systems of...

This book introduces an analytic method to describe the shadow of black holes. As an introduction, it presents a survey of the attempts to observe the shadow of galactic black holes. Based on a detailed discussion of the Plebański-Demiański class of space-times, the book derives analytical formulas for the photon regions and for the boundary curve of the shadow as seen by an observer in the domain of outer communication. It also analyzes how the shadow depends on the motion of the observer. For all cases, the photon regions and shadows are visualized for various values of the...

UFOs and Aliens: The Complete Guidebook, by award-winning Tennessee author and Southern historian Colonel Lochlainn Seabrook, is the ultimate primer for beginners, an invaluable resource for veteran ufologists, and a one-of-a-kind work that's packed with just about everything you'll ever want to know about extraterrestrials and their out-of-this-world craft.

Colonel Seabrook writes knowledgeably, with verve and clarity, making the journey through this complex topic both entertaining and educational. Well researched, the book includes detailed descriptions of UFOs and...

This book provides the only critical edition and English translation of Maḥmūd al-Jaghmīnī's al-Mulakhkhaṣ fī al-hayʾa al-basīṭa, the most widely circulated Arabic treatise on Ptolemaic astronomy ever written. Composed in the early 13^th century, this introductory textbook played a crucial role in the teaching, dissemination, and institutional instruction of Islamic astronomy well into the 19^th century (and beyond). Establishing the base text is a fundamental prerequisite for gaining insights into what was considered an...

This book suitable for post graduates in Physics and Astrophysics aims at introducing the theory of general relativity as an important background for doing astrophysics. Starting from a detailed discussion of the various mathematical concepts for doing general relativity, the book introduces the geometric description of gravity. It gives a brief historical perspective to classical mechanics and electrodynamics making an attempt to establish the necessity of special relativity as propounded by Einstein extending to General Relativity. This book is a good starting point for post graduates...