Martin Griffiths Livres

This book contains everything you need to know about variable stars -- stars whose brightness varies noticeably over time. The study of variable stars has been a particularly popular area of research for amateurs for many years; the material contained herein serves as both an introduction to amateur astronomers and a useful reference source for seasoned variable star observers. With its thorough, non-mathematical descriptions of variable stars and tips for how to see them, this book enables novices and experts alike to set off into the field and observe a wide range of delightful sights. It strikes a balance between easily visible objects that can be seen in any telescope or binoculars, and variable stars that are a direct challenge to those with large aperture equipment or access to photometric tools and methods. After helping the observer differentiate between variable star types, the author goes on to explain the skills needed to operate a telescope and other equipment, as well as how to couple filters to a CCD camera or digital SLR camera in order to photometrically record these celestial objects. Further, the book includes an observational guide to 50 objects for study, with finder charts and data about light curves for ease of identification, along with the stars’ celestial coordinates, magnitudes, and other pertinent information.

Features sections on Constructivism, International Political Theory, and English School. This work is suitable for students of politics and international relations and also for those who want to gain an understanding of how nations can work together successfully.

Focusing on the practical applications of optical filters in astronomy, this book serves as a comprehensive guide for both observational and imaging purposes. It details various types of filters available in amateur astronomy, offering insights into their specific uses and benefits. Whether for enhancing visibility or improving image quality, this resource equips readers with the knowledge needed to effectively utilize filters in their astronomical endeavors.

Dark Land, Darks Skies subverts conventional astronomy by repopulating the night sky with myths from oral traditions which were overtaken by the classical naming of constellations and planets as astronomy developed in the sixteenth and seventeenth century. Astronomer Martin Griffiths includes star charts and other helpful materials for star-gazing.