Radio telescopes have the potential of recording images in the universe at a resolution nearly 1,000 times higher than the Hubble Space telescope. To attain this resolution, astronomers rely on a technology called Very Long Baseline Interferometry (VLBI). With the launch of the first VLBI satellite, Very Long Baseline Array has now come into actual operation. This, as well as other developments over the last 10 years, has increased the need for an up-to-date technical reference in radio astronomy. The first edition of this title was seen as the standard reference on the subject and this edition provides a comprehensive account today's techniques used in interferometry and radio astronomy.