This innovative assessment of the current state of International Relations theory diagnoses a deep malaise in the field and proposes a reorientation from metatheoretical concerns to the theoretical exploration of central policy issues and dilemmas confrinting the 21st century world.

Martin Griffiths provides a reinterpretation of the terms 'realism' and 'idealism' in international relations through a thorough critical examination of three key figures in international theory: Hans Morgenthau, Kenneth Waltz and Hedley Bull.

As a casual read through any of the major amateur astronomical magazines will demonstrate, there are filters available for all aspects of optical astronomy. This book provides a ready resource on the use of the following filters, among others, for observational astronomy or for imaging:

• Light pollution filters
• Planetary filters
• Solar filters
• Neutral density filters for Moon observation
• Deep-sky filters, for such objects as galaxies, nebulae and more

Deep-sky objects can be imaged in much greater detail than was possible many years...

This book enables anyone with suitable instruments to undertake an examination of nebulae and see or photograph them in detail. Observing Nebulae provides a ready resource to allow anyone with a little experience in astronomy, whether professional or amateur, to locate, identify and record the nebulae in our home galaxy.