Astronomi, sted og tid

This book provides a practical guide to astronomy for surveyors. It covers topics such as spherical trigonometry, the use of instruments, and the calculation of distances. The text is suitable for students in surveying and anyone with an interest in practical astronomy.This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it.This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

The solar system has captured the imagination of scientists and laypeople alike for centuries. In this comprehensive and authoritative work, J. Russell Hind provides a detailed account of the sun, moon, and planets, including their origins, physical properties, and movements in space. He also covers the latest discoveries in the field, including the discovery of new planets and the exploration of space. This is a must-read for anyone interested in the mysteries of the universe.This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it.This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

An exploration of the history and science of timekeeping, from the earliest sundials to the latest atomic clocks. The book describes various methods and devices used to measure time, including mechanical clocks, water clocks, and astronomical observations. The author also explains the principles behind modern time standards like Greenwich Mean Time (GMT).This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it.This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

This book provides a detailed biographical account of the industrious late nineteenth-century astronomer William Frederick Denning who, in later life, rose to be a celebrated public figure and a highly respected amateur astronomer. The book also examines Denning¿s many contributions to the astronomy of his time.As an indomitable promotor of amateur astronomy, Denning was closely involved in the formation of the short-lived, but historically pivotal, Observational Astronomy Society (OAS) in 1869. Readers will learn about the origins and the observational programs initiated by the OAS, and the author also presents a series of biographical sketches of its most industrious members. Furthermore, by examining Denning¿s letters and publications, the author shows how he helped to nurture the growth of amateur astronomy, also teaching amateur observers how to make their efforts scientifically useful.A stalwart observer and enthusiast himself, Denning was a key player in the development of meteor astronomy in England, culminating in his being invited, in 1922, to be the first President of Commission 22 (meteors, meteorites and interplanetary dust) of the newly formed International Astronomical Union. The text follows the development and rapid growth of meteor astronomy during the nineteenth century, focusing upon the key observations and important theoretical advances. In addition, it pays tribute to pioneering practitioners, who, along with Denning, set out to unravel the story and secrets of the shooting stars.While not an openly forthright or strident figure, Denning, at the height of his career, became embroiled in two public and controversial issues. The first related to his pseudo-scientific theory of optical blurring, and his belief that large-aperture telescopes performed less efficiently than smaller-aperture telescopes when used in the study of planetary disks. The second concerned the mysterious issue of stationary meteor shower radiants¿an apparent observational reduction that was completely at odds with both the standard theories of gravitational dynamics and the generally accepted notion of meteoroid stream structure. The book explores these two controversies and uses them to examine Denning¿s outlook on scientific methodology.

"The past is a mental recollection or record of events that took place in the present. Therefore, only two states of reality exists, and that is the present and the future. What "is" and what will "be." The past is not a fixed or objective reality. It is a fluid state, often changed by our perceptions."Time, time travel, black holes, the origins of the universe, and the thirteen month calendar are explored in this philosophical look at the Universe. This book is not about humanity's philosophical relationship with time, but rather a fundamental understanding of how time functions in our society and universe. We must first define what it is, before we can explore why it is.

"Experts Plebaânski and Krasiânski provide a thorough introduction to the tools of general relativity and relativistic cosmology, guiding advanced students through complete derivations of the results. Starting with a short course on differential geometry, the main text describes relativity as a physical theory"--

A Defence of Our Intergalactic Common Interests

Porphyrin Sensitizers for Solar Cells" by Jonnadula V S Krishna is a comprehensive guide to the applications of porphyrin-based dyes in dye-sensitized solar cells (DSSCs). The book covers the various aspects of porphyrin sensitizers and their potential use in solar cells, including their synthesis, characterization, and performance in solar cells. The book begins with an introduction to the principles of solar energy conversion and an overview of different types of solar cells. It then focuses on the design and synthesis of porphyrin sensitizers, including their electronic and photophysical properties. The author also discusses various techniques for characterizing porphyrin sensitizers, such as UV-vis absorption, fluorescence, and electrochemical methods. The book then delves into the performance of porphyrin sensitizers in solar cells, including their efficiency, stability, and compatibility with different types of electrolytes. The author also explores the various factors that can affect the performance of porphyrin-based solar cells, such as the nature of the sensitizers, the thickness of the dye layer, and the composition of the electrolyte. Overall, "Porphyrin Sensitizers for Solar Cells" is an essential resource for researchers and engineers working in the field of solar energy conversion, as well as for graduate students and advanced undergraduates in chemistry, materials science, and physics. The book provides a thorough and up-to-date overview of the latest research on porphyrin sensitizers, making it an invaluable reference for anyone interested in this exciting field.

Introductory Astrochemistry: From Inorganic to Life-Related Materials provides a detailed examination of the origins of planets, their satellites, and the conditions that led to life itself. Drawing on theories, experiments, observations, calculations, and analytical data from five distinct astrosciences, including astronomy, astrobiology, astrogeology, astrophysics, and astrochemistry, the book provides a comprehensive understanding of the formation and evolution of our Solar System and applies it to other solar systems. The book begins with fundamental knowledge in the astrosciences, building upon understanding systematically up to the formation of the early Solar System. This book is an interdisciplinary reference for researchers and advanced students in astrogeology, astrophysics, astrochemistry, astrobiology, astronomy, and other space sciences, helping to foster a deeper understanding of the interconnections between these disciplines.

Pebbles on the Cosmic Seashore: A Lifetime of Astronomical Discoveries is a beautifully written introductory work on the science of astronomy. A compilation of original essays intended for the enlightenment of a general audience, Pebbles on the Cosmic Seashore is divided into two parts.In Part I, the author transports the reader on a temporal, and at times poetic, voyage of discovery. Hypothesizing that the science of astronomy emerged out of the sense of awe with which paleolithic peoples regarded the heavens, he traces its advance into the realms of mythopoetic thought, in which the motions of the heavenly bodies were attributed to gods and enshrined in mythPart II is a magisterial depiction of the wonders of the Solar System and beyond. Opening with a description of the startling beauty of the Earth, "our home," Part II then introduces its readers to the earth's closest neighbors within the solar system. It then moves on to a discussion of the constellations of stars that lay beyond our own region of the heavens, and, finally, suggests that someday humankind will explore this greater world so seemingly at present beyond our reach. Humanity, the author believes, is perched upon the cusp of a great decision:Elizabeth Harvey, Ph.D.Professor of History, Merced College

Rapid Advances in Cosmology Reveal the Universe's SecretsCosmology has seen rapid advances in the last few decades, thanks to the collection and analysis of vast amounts of data about the universe. This has led to a more precise understanding of the universe's contents, which in turn has severely constrained theoretical speculations.One of the most important advances in cosmology has been the confirmation of the concordance model, ¿CDM. This model describes the universe as consisting of approximately 70% dark energy, 25% dark matter, and 5% ordinary matter. The concordance model is supported by a wide range of observations, including the cosmic microwave background, large-scale structure, and supernovae.Another important advance has been the discovery of exoplanets. Exoplanets are planets that orbit other stars, and they have been found in a wide variety of sizes and orbits. The discovery of exoplanets suggests that planets are common in the universe, and it raises the possibility that life may exist beyond Earth.The rapid advances in cosmology have led to a number of new insights into the universe. For example, we now know that the universe is expanding at an accelerating rate, and that dark energy is responsible for this acceleration. We also know that the universe is much older than previously thought, and that it has a flat geometry.The concordance model has also led to new constraints on theoretical speculations about the universe. For example, the model suggests that the universe is unlikely to be infinite in size or age. The model also suggests that the universe is unlikely to be cyclic, meaning that it will not go through an infinite number of Big Bangs and Big Crunches.The rapid advances in cosmology have revolutionized our understanding of the universe. We now have a more precise understanding of the universe's contents and evolution than ever before. This understanding has led to new insights into the universe and has constrained theoretical speculations.

The idea of a Space Elevator is among the most ambitious and mind-boggling in the history of technology fantasies imagined by humans. For decades, this far-fetched idea that was long considered the purview of science fiction has captivated the minds of scientists, engineers, and visionaries. Readers of "The Space Elevator: A History of a Visionary Technology" will be taken on an exciting voyage through the development of this revolutionary idea, with insights into the scientific, cultural, and historical components that have contributed to the concept's ongoing fascination.This well-researched and entertaining book explores the history of the Space Elevator, from its conception by visionary minds like Konstantin Tsiolkovsky in the early 20th century to the present day. As the novel progresses, readers will be taken back in time to experience pivotal events, such as the space race in the middle of the twentieth century, which fed the flames of creativity and led to the development of the technologies that would eventually make the Space Elevator a reality.Both the enormous tensile strength necessary for the tether material and the hard logistics of creating such a massive structure are discussed in the book as obstacles to their realization. The technical, economic, and environmental challenges that must be overcome to make this ideal a reality are laid bare for readers through the experiences of visionaries, scientists, and early adopters in the field.The Space Elevator also investigates the cultural and societal effects of such a revolutionary invention. How would a Space Elevator change our perspective on space travel, disrupt existing industries, and reduce the negative effects on the environment caused by current means of getting to space? These and other problems are probed with deep and interesting analysis.An exciting and enlightening journey through the past, present, and future of one of humanity's most audacious and compelling technological dreams, "The Space Elevator: A History of a Visionary Technology" invites readers to take. If you're at all curious about space travel, cutting-edge technology, or the tenacity of the human imagination, this book is required reading

Many types of variable stars obey strict relationships between their pulsation periods and brightnesses. The contributions in this volume offer significant new insights from a wealth of recent observations into the period-luminosity relations governing pulsating variables and their implications for the cosmic distance scale.

This thesis addresses the feasibility of the production of ultra-high-energy cosmic rays in starburst galaxies and active galactic nuclei. These astrophysical objects were theoretically proposed as candidate sources a long time ago. Nevertheless, the interest in them has been recently renewed due to the observational data collected by the Pierre Auger Observatory and the Telescope Array. In this work, a comprehensive review of the current status of the research on cosmic rays accelerators is provided, along with a summary of the principal concepts needed to connect these relativistic particles with electromagnetic and neutrino observations in the multi-messenger era. On one hand, the hypothesis of accelerating particles with energies above 10' eV in starburst superwinds is carefully revisited, taking into account the constraints imposed by the most recent electromagnetic observations. On the other hand, an alternative new model for the gamma emission of the nearby active galaxy NGC 1068 is presented. The implications of the results of these studies are discussed in terms of the contemporary observatories and prospects for future experiments are offered.

The Plurality of Worlds, a classical book, has been considered essential throughout the human history, and so that this work is never forgotten we at Alpha Editions have made efforts in its preservation by republishing this book in a modern format for present and future generations. This whole book has been reformatted, retyped and designed. These books are not made of scanned copies of their original work and hence the text is clear and readable.

The Moon, a classical book, has been considered essential throughout the human history, and so that this work is never forgotten we at Alpha Editions have made efforts in its preservation by republishing this book in a modern format for present and future generations. This whole book has been reformatted, retyped and designed. These books are not made of scanned copies of their original work and hence the text is clear and readable.

A Plan for Securing Observations of the Variable Stars, a classical book, has been considered essential throughout the human history, and so that this work is never forgotten we at Alpha Editions have made efforts in its preservation by republishing this book in a modern format for present and future generations. This whole book has been reformatted, retyped and designed. These books are not made of scanned copies of their original work and hence the text is clear and readable.

Pioneers of Science, a classical book, has been considered essential throughout the human history, and so that this work is never forgotten we at Alpha Editions have made efforts in its preservation by republishing this book in a modern format for present and future generations. This whole book has been reformatted, retyped and designed. These books are not made of scanned copies of their original work and hence the text is clear and readable.