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...

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...

Planetary Nebulae and How to Observe Them is for amateur astronomers who want to go beyond the Messier objects, concentrating on one of the most beautiful classes of astronomical objects in the sky. Planetary nebulae are not visible to...

"Fifty Key Thinkers in International Relations" von Martin Griffiths ist ein umfassender Leitfaden, der die Ideen und Beiträge von fünfzig einflussreichen Denkern im Bereich der internationalen Beziehungen vorstellt. Das Buch bietet...