Spherical or positional astronomy is used primarily to map objects on the celestial sphere. In this technical work, first published in 1908 and intended for advanced students, Sir Robert Stawell Ball (1840-1913) breaks down the field into distinct areas of study. Assuming a good level of geometry and trigonometry, he begins with fundamental formulae before moving into the determination of coordinates, atmospheric refraction, the theory of cartography, and more. Each section contains exercises derived from a variety of sources, including contemporary Cambridge examinations. The coverage ranges from the calculation of stellar parallax to the geometrical principles behind the Mercator projection. Testifying to the knowledge expected of university students in the early twentieth century, Ball's book remains instructive to their modern counterparts. More accessible to the general reader, The Story of the Heavens (1885), Star-Land (1889) and A Popular Guide to the Heavens (1905) are also reissued in this series.
Nemec gives the Silver State's most-productive fisheries the complete treatment in this definitive guide for both the famous and underrated flyfishing opportunities in Nevada. Includes detailed maps, hub city information, where to find fly shops, and other necessary details to plan an exciting trip.
The birth of the Christian Church, and what it means for modern religion and philosophy. This engaging guide presents an accessible overview of the birth of the Christian church, using the historical works found at the famous Nag Hammadi site in Egypt. With chapters discussing each of the major and minor documents found at Nag Hammadi, this volume also includes an overview of Gnosticism and the major players, revealing not only what the texts say, but also what they mean. -Renewed interest in Gnosticism and the Gnostic gospels is driven by interest in the Nag Hammadi documents, The DaVinci Code, the Matrix movies, the Kabbalah, renewed interest in the divine feminine ideal, and the fact that many who've left the Church are looking for new answers in the early church -Author is a scholar and expert who's studied with some of the top people in the field