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Books > Science & Mathematics > Astronomy, space & time > General
In 2008, the European FP6 JETSET project ended. JETSET, for Jet, Simulations, Experiments, and Theory, was a joint research network of European expert teams on protostellar jets. The present proceedings are a collection of contributions presenting new results obtained by those groups since the end of the JETSET program. This is also the occasion to celebrate Kanaris Tsinganos' important contributions to this network and for his enlightening insight in the subject that inspired us all. Some of the former JETSET students are now in the academic world and the subject has never been so alive. So we present here a collection of results of what has been done in the field of protostellar jets in the past ten years from the theoretical, numerical, observational and experimental point of view. We also present new challenges in the field of protostellar jets and what we should expect from the development of new instruments and new numerical codes in the near future. We also gather results on the impact of the study of protostellar jets on other jet studies in particular on relativistic jets. As a matter of fact, it is time for a new network.
This book analyses the magnificent imperial necropolises of ancient China from the perspective of Archaeoastronomy, a science which takes into account the landscape in which ancient monuments are placed, focusing especially but not exclusively on the celestial aspects. The power of the Chinese emperors was based on the so-called Mandate of Heaven: the rulers were believed to act as intermediaries between the sky gods and the Earth, and consequently, the architecture of their tombs, starting from the world-famous mausoleum of the first emperor, was closely linked to the celestial cycles and to the cosmos. This relationship, however, also had to take into account various other factors and doctrines, first the Zhao-Mu doctrine in the Han period and later the various forms of Feng Shui. As a result, over the centuries, diverse sacred landscapes were constructed. Among the sites analysed in the book are the "pyramids" of Xi'an from the Han dynasty, the mountain tombs of the Tang dynasty, and the Ming and Qing imperial tombs. The book explains how considerations such as astronomical orientation and topographical orientation according to the principles of Feng Shui played a fundamental role at these sites.
This textbook presents the basics of philosophy that are necessary for the student and researcher in science in order to better understand scientific work. The approach is not historical but formative: tools for semantical analysis, ontology of science, epistemology, and scientific ethics are presented in a formal and direct way. The book has two parts: one with the general theory and a second part with application to some problems such as the interpretation of quantum mechanics, the nature of mathematics, and the ontology of spacetime. The book addresses questions such as "What is meaning?", "What is truth?", "What are truth criteria in science?", "What is a theory?", "What is a model?" "What is a datum?", "What is information?", "What does it mean to understand something?", "What is space?", "What is time?", "How are these concepts articulated in science?" "What are values?" "What are the limits of science?", and many more. The philosophical views presented are "scientific" in the sense that they are informed by current science, they are relevant for scientific research, and the method adopted uses the hypothetical-deductive approach that is characteristic of science. The results and conclusions, as any scientific conclusion, are open to revision in the light of future advances. Hence, this philosophical approach opposes to dogmatic philosophy. Supported by end-of-chapter summaries and a list of special symbols used, the material will be of interest for students and researchers in both science and philosophy. The second part will appeal to physicists and mathematicians.
Analytical solutions to the orbital motion of celestial objects have been nowadays mostly replaced by numerical solutions, but they are still irreplaceable whenever speed is to be preferred to accuracy, or to simplify a dynamical model. In this book, the most common orbital perturbations problems are discussed according to the Lie transforms method, which is the de facto standard in analytical orbital motion calculations.
This book includes 58 selected articles that highlight the major contributions of Professor Radha Charan Gupta-a doyen of history of mathematics-written on a variety of important topics pertaining to mathematics and astronomy in India. It is divided into ten parts. Part I presents three articles offering an overview of Professor Gupta's oeuvre. The four articles in Part II convey the importance of studies in the history of mathematics. Parts III-VII constituting 33 articles, feature a number of articles on a variety of topics, such as geometry, trigonometry, algebra, combinatorics and spherical trigonometry, which not only reveal the breadth and depth of Professor Gupta's work, but also highlight his deep commitment to the promotion of studies in the history of mathematics. The ten articles of part VIII, present interesting bibliographical sketches of a few veteran historians of mathematics and astronomy in India. Part IX examines the dissemination of mathematical knowledge across different civilisations. The last part presents an up-to-date bibliography of Gupta's work. It also includes a tribute to him in Sanskrit composed in eight verses.
This is a revealing account of the family life and achievements of the Third Earl of Rosse, a hereditary peer and resident landlord at Birr Castle, County Offaly, in nineteenth-century Ireland, before, during and after the devastating famine of the 1840s. He was a remarkable engineer, who built enormous telescopes in the cloudy middle of Ireland. The book gives details, in an attractive non-technical style which requires no previous scientific knowledge, of his engineering initiatives and the astronomical results, but also reveals much more about the man and his contributions - locally in the town and county around Birr, in political and other functions in an Ireland administered by the Protestant Ascendancy, in the development and activities of the Royal Society, of which he was President from 1848-54, and the British Association for the Advancement of Science. The Countess of Rosse, who receives full acknowledgement in the book, was a woman of many talents, among which was her pioneering work in photography, and the book includes reproductions of her artistic exposures, and many other attractive illustrations. -- .
Introduction.- Boarding School and University.- Astronomy Around 1875.- Astronomer and Professor.- Almost Half a Million Stars.- Laboratory and Statistical Astronomy.- Star Streams.- In the mean time in Groningen.- Mount Wilson.- Statistics and other matters.- First Attempt: the Kapetyn Universe.- Coda.
Is the Earth the right model and the only universal key to understand habitability, the origin and maintenance of life? Are we able to detect life elsewhere in the universe by the existing techniques and by the upcoming space missions? This book tries to give answers by focusing on environmental properties, which are playing a major role in influencing planetary surfaces or the interior of planets and satellites. The book gives insights into the nature of planets or satellites and their potential to harbor life. Different scientific disciplines are searching for the clues to classify planetary bodies as a habitable object and what kind of instruments and what kind of space exploration missions are necessary to detect life. Results from model calculations, field studies and from laboratory studies in planetary simulation facilities will help to elucidate if some of the planets and satellites in our solar system as well as in extra-solar systems are potentially habitable for life.
Greenwich has been a centre for scientific computing since the foundation of the Royal Observatory in 1675. Early Astronomers Royal gathered astronomical data with the purpose of enabling navigators to compute their longitude at sea. Nevil Maskelyne in the 18th century organised the work of computing tables for the Nautical Almanac, anticipating later methods used in safety-critical computing systems. The 19th century saw influential critiques of Charles Babbage's mechanical calculating engines, and in the 20th century Leslie Comrie and others pioneered the automation of computation. The arrival of the Royal Naval College in 1873 and the University of Greenwich in 1999 has brought more mathematicians and different kinds of mathematics to Greenwich. In the 21st century computational mathematics has found many new applications. This book presents an account of the mathematicians who worked at Greenwich and their achievements. Features A scholarly but accessible history of mathematics at Greenwich, from the seventeenth century to the present day, with each chapter written by an expert in the field The book will appeal to astronomical and naval historians as well as historians of mathematics and scientific computing.
In 1908, three years after Einstein first published his special theory of relativity, the mathematician Hermann Minkowski introduced his four-dimensional "spacetime" interpretation of the theory. Einstein initially dismissed Minkowski's theory, remarking that "since the mathematicians have invaded the theory of relativity I do not understand it myself anymore." Yet Minkowski's theory soon found wide acceptance among physicists, including eventually Einstein himself, whose conversion to Minkowski's way of thinking was engendered by the realization that he could profitably employ it for the formulation of his new theory of gravity. The validity of Minkowski's mathematical "merging" of space and time has rarely been questioned by either physicists or philosophers since Einstein incorporated it into his theory of gravity. Physicists often employ Minkowski spacetime with little regard to the whether it provides a true account of the physical world as opposed to a useful mathematical tool in the theory of relativity. Philosophers sometimes treat the philosophy of space and time as if it were a mere appendix to Minkowski's theory. In this critical study, Joseph Cosgrove subjects the concept of spacetime to a comprehensive examination and concludes that Einstein's initial assessment of Minkowksi was essentially correct.
Astronomy isthemostancientsciencehumanshavepracticedonEarth. Itisascienceofextremesandoflargenumbers:extremesoftime-fromthe big bang to in?nity -, of distances, of temperatures, of density and masses, ofmagnetic?eld,etc.Itisasciencewhichishighlyvisible,notonlybecause stars and planets are accessible in the sky to the multitude, but also - cause the telescopes themselves are easily distinguishable, usually on top of scenic mountains, and also because their cost usually represent a subst- tialproportionofthenation'sbudgetandofthetaxpayerscontributionsto that budget. As such, astronomy cannot pass unnoticed. It touches on the origins of matter, of the Universe where we live, on life and on our destiny. It touches on philosophy as well as on religion. Astronomy is the direct c- tactofhumankindwithitsoriginsandtheimmensityofuniversalnature.It is indeed a science of observation where experimentation is practically - possible and which is ruled by mathematics, physics, chemistry, statistical analysis and modelling, while o?ering the largest number of veri?cations of the most advanced theories of fundamental physics such as general r- st ativity and gravitation. At the beginning of the 21 century astronomy is clearly a multidisciplinary activity touching on all aspects of science. It is therefore logical that in the past and still now, astronomy has attracted the most famous scientists, be they pure observers, mathematicians, physicists, biologists, experimentalists, and even politicians.
Anyone who doubts that astronomy is enjoying a golden age has only to browse the pages of Organizations and Strategies in Astronomy, Vol. 5. Our golden age is defined not only by the enormity of new discoveries of dark energy, dark matter, extra-solar planets, and the evolution of Mars, but also by the breadth, diversity, and creativity within our community. This volume records our history, in a period of such rapid change and growth that individual astronomers are hard-pressed to keep abreast of their own fields and neighborhoods, much less of developments world-wide. Since the 1950's, changes in the landscape of astronomy are manifold. We have witnessed two epochs of big telescope construction, the 4-meter class telescopes of the '60s and '70s and the 8-to lO-meter class telescopes of the '90s, continuing through today. We accomplished the transition from photographic to digital data, and we continue to improve the size and sen sitivity of astronomical detectors. We have witnessed the flowering of radio astronomy and the opening of the full electromagnetic spectrum through space astronomy. We have seen the growth of national and international astronomy facilities, and a dramatic broadening of the accessibility of data, both through observing facilities available through open competition based on scientific merit and through deep, rich archives of data. |
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