This IAU Symposium brought together researchers who use CCDs and arrays, designers and manufacturers of CCDs and array mosaics, and those who write the software to control these devices and to reduce the large amounts of data contained in each frame. At the meeting such topics as plans for applying the new technology to the new large telescopes that have been built recently and those planned in the near future, new developments in infra-red arrays, advances and concerns with the use of CCDs in photometry and spectroscopy and the creation of large mosaics in photometry and spectroscopy, and the creation of large mosaics of chips which allow larger areas of the sky to be covered in a single frame were discussed. There were sessions devoted to the following topics: new developments in CCD technology; new developments in IR detector arrays; direct imaging with CCDs and other arrays; spectroscopy with CCDs and other arrays; and large field imaging with array mosaics. Scientific results of studies made with this technology were covered in the poster sessions. CCD and array detectors have become the detectors of choice at all the world's optical observatories. Such instruments on small university and college telescopes have turned these telescopes into instruments that can now do observations which in the past were done only on the largest telescopes. CCDs and arrays are known as "the people's detector" because of their ability to turn small telescopes into true research instruments. On large telescopes observations can be made of extremely faint and crowded objects that were impossible to observe before the advent of CCD and Array technology. The proceedings of this meeting should be useful to all those who are interested in the design, manufacture and use of CCDs and arrays for astronomical observations.

IAU Symposium No. 167 brought together researchers who use CCDs and arrays, designers and manufacturers of CCDs and Array Mosaics and those who write the software to control these devices and to reduce the large amounts of data contained in each frame. At the meeting such topics as plans for applying the new technology to the new large telescopes that have been built recently and those planned in the near future, new developments in infrared arrays, advances and concerns with the use of CCDs in photometry and spectroscopy and the creation of large mosaics in photometry and spectroscopy and the creation of large mosaics of chips which allow larger areas of the sky to be covered in a single frame were discussed. There were sessions devoted to the following topics: New Developments in CCD Technology; New Developments in IR Detector Arrays; Direct Imaging with CCDs and Other Arrays; Spectroscopy with CCDs and Other Arrays; and Large Field Imaging with Array Mosaics. Scientific results of studies made with this technology were covered in the poster sessions. CCD and Array Detectors have become the detectors of choice at all the world's optical observatories. Such instruments on small university and college telescopes have turned these telescopes into instruments that can now do observations which in the past were done only on the largest telescopes. CCDs and Arrays are known as the people's detector' because of their ability to turn small telescopes into true research instruments. On large telescopes observations can be made of extremely faint and crowded objects that were impossible to observe before the advent of CCD and Array technology. The proceedings of this meeting will be useful toall those who are interested in the design, manufacture and use of CCDs and Arrays for astronomical observations.

I.A.U. Symposium No. 133, "Mapping the Sky: Past Heritage and Future Directions" was held at Paris on 1-5 June, 1987. The rationale for this meeting is to combine historical and modern aspects of mapping the sky; historical in that the meeting celebrates the initiation of the carte du Ciel at the Observatoire de Paris in 1887 and evaluates its impact on astrometry and astronomy in general. And modern in the sense that now in optical, radio and other wavelengths the sky is and needs to be charted in detail. The Symposium also commemorates the 150th anniversary of the first trigonometric parallax. The proposal for the meeting closely involved the sponsoring I.A.U. Commissions 24 and 41 and their respective officers. The Scientific Organizing Committee included the two current presidents of these commissions as co-chairmen (A.R. Upgren and J.A. Eddy, respectively) along with V. Abalakin. S. Debarbat, Ch. de Vegt, R.L. Duncombe, H.K. Eichhorn, M. Hoskin, J.A. Hughes, C. Jaschek, P.G. Kulikovsky, C.A. Murray and P.A. Wayman. The L.O.C. consisted of P. Charvin (chairman), S. Grillot, L. Garin and R. Weinstein; they were helped by M. Alibert (secretary), G. Rault, S. Seguier, J. Counil and S. Debarbat. Additional financial support was provided by the Division of History of Science, International Union for the History and Philosophy of Science.

The stars that form a halo around our Galaxy are intriguing; they have abundances of elements that suggest they are old. The properties of these 'hot stars' and similar stars in other galaxies challenge the well-established theory of stellar evolution in many ways. Studying the collective properties of these stars provides important input to many areas of astrophysics - including the formation of our Galaxy, stellar evolution and the stellar populations of other galaxies. The study of hot stars in the halo of our Galaxy is undergoing an exciting renaissance owing to important new observations with the Hubble Space Telescope and ASTRO1 and to techniques recently developed for ground-based observations. Advances in computers have also recently led to a far more detailed and complete theoretical understanding of stellar evolution. This volume, first published in 1994, draws together the proceedings of a conference held in Union College, New York, which gathered experts in the field in question.

Do you sometimes wonder why the sky at dusk is filled with color, or how the moon controls the tides? Why do stars twinkle and planets don't? Interested in refining your star-gazing techniques? You don't need any special equipment to marvel at the beauty of the universe, and Night Has a Thousand Eyes will place the cosmic within your grasp.

If you want to know why werewolves only come out at night, are curious about twilight, the seasons and their causes, our solar system, light and darkness, weather, stars and latitude, the moon, light pollution, and the planets, this is the book for you. Filled with science and lore, with references to myths, legends, and "high" and popular culture, this "naked-eye" guide -- no telescope required -- demystifies the celestial in accessible, instructive, and entertaining prose. Night Has a Thousand Eyes is the perfect resource for amateur astronomers and meteorologists of all ages -- city, suburban, and country folk alike -- who pause to enjoy sunsets and identify constellations on a starry night. Illustrated throughout with photographs, sky charts, and diagrams.

The stars that comprise a halo around our Galaxy are the source of intrigue - they have abundances of elements that suggest they are old. The properties of these hot stars and similar stars in other galaxies challenge the current, well-established theory of stellar evolution in many ways. Studying the collective properties of these stars provides important input to many areas of astrophysics - including the formation of our Galaxy, the late phases of stellar evolution and the stellar populations of other galaxies. The study of hot stars in the halo of our Galaxy is undergoing a renaissance owing to new observations with the Hubble Space Telescope and ASTRO1 and to techniques recently developed for ground-based observations. Advances in computers have also recently led to a far more detailed and complete theoretical understanding of stellar evolution. A conference was held in Union College, New York, to gather experts in the field. This volume draws together their articles with the aim of providing an up-to-date and comprehensive review for graduate students and researchers.