This book provides an overview of the astronomical practices that continued through the so-called "Dark Ages." Like the astronomies of traditional societies, early medieval astronomies established a religious framework of sacred time and ritual calender; here Christian feasts tied to a pre-Christian ritual solar calender, the date of Easter tied to the Hebrew lunar calender; and the timing of monastic prayers in terms of the course of the stars. Coupled with the remnants of ancient geometrical astronomy, these provided the framework for the rebirth of astronomy with the rise of the medieval universities.
The Structure of Rare-Earth Metal Surfaces introduces the concepts of surface crystallography and surface-structure determination, outlines the principles of the most widely used experimental techniques and theoretical simulations, and reviews their application to the surfaces of rare-earth metals. In particular, the results of quantitative low-energy electron-diffraction experiments and multiple-scattering calculations are covered in some depth. The book is aimed at science graduates with an interest in surface crystallography. Contents: Introduction to the Rare Earths; The Basics of Surface Structure; Surface Structure Techniques; Crystal Growth and Surface Preparation; Rare-Earth Surface Science; Quantitative Low-Energy Electron Diffraction; Quantitative LEED Results; Summary OCo Past, Present and Future. Readership: Researchers in surface and interface science, crystallography, condensed matter physics and computational physics.
This book examines memoir-writing by many of the key political actors in the Northern Irish Troubles (19691998), and argues that memoir has been a neglected dimension of the study of the legacies of the violent conflict. It investigates these sources in the context of ongoing disputes over how to interpret Northern Irelands recent past. A careful reading of these memoirs can provide insights into the lived experience and retrospective judgments of some of the main protagonists of the conflict. The period of relative peace rests upon an uneasy calm in Northern Ireland. Many people continue to inhabit contested ideological territories, and in their strategies for shaping the narrative telling of the conflict, key individuals within the Protestant Unionist and Catholic Irish Nationalist communities can appear locked into exclusive and self-justifying discourses. In such circumstances, while some memoirists have been genuinely self-critical, many others have utilised a post-conflict language of societal
It was the astronomers and mathematicians of the Islamic world who provided the theories and concepts that paved the way from the geocentric theories of Claudius Ptolemy in the second century AD to the heliocentric breakthroughs of Nicholas Copernicus and Johannes Kepler in the sixteenth and seventeenth centuries. Algebra, the Arabic numeral system, and trigonometry: all these and more originated in the Muslim East and undergirded an increasingly accurate and sophisticated understanding of the movements of the Sun, Moon, and planets. This nontechnical overview of the Islamic advances in the heavenly sciences allows the general reader to appreciate (for the first time) the absolutely crucial role that Muslim scientists played in the overall development of astronomy and astrology in the Eurasian world.
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