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Islamic Astronomy And Geography

RRP $317.99

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This volume of 12 studies, mainly published during the past 15 years, begins with an overview of the Islamic astronomy covering not only sophisticated mathematical astronomy and instrumentation but also simple folk astronomy, and the ways in which astronomy was used in the service of religion. It continues with discussions of the importance of Islamic instruments and scientific manuscript illustrations. Three studies deal with the regional schools that developed in Islamic astronomy, in this case, Egypt and the Maghrib. Another focuses on a curious astrological table for calculating the length of life of any individual. The notion of the world centred on the sacred Kaaba in Mecca inspired both astronomers and proponents of folk astronomy to propose methods for finding the qibla, or sacred direction towards the Kaaba; their activities are surveyed here. The interaction between the mathematical and folk traditions in astronomy is then illustrated by an 11th-century text on the qibla in Transoxania. The last three studies deal with an account of the geodetic measurements sponsored by the Caliph al-Ma'mA"n in the 9th century; a world-map in the tradition of the 11th-century polymath al-BA(R)rA"nA(R), alas corrupted by careless copying; and a table of geographical coordinates from 15th-century Egypt.


Astronomy Today, Books A La Carte Plus Masteringastronomy With Etext -- Access Card Package

RRP $428.99


Interferometry And Synthesis In Radio Astronomy 2e

RRP $397.99

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<b>Comprehensive, authoritative coverage of interferometric techniques for radio astronomy</b> <p> In this Second Edition of <i>Interferometry and Synthesis in Radio Astronomy</i>, three leading figures in the development of large imaging arrays, including very-long-baseline interferometry (VLBI), describe and explain the technology that provides images of the universe with an angular resolution as fine as 1/20,000 of an arcsecond. <p> This comprehensive volume begins with a historical review followed by detailed coverage of the theory of interferometry and synthesis imaging, analysis of interferometer response, geometrical relationships, polarimetry, antennas, and arrays. Discussion of the receiving system continues with analysis of the response to signals and noise, analog design requirements, and digital signal processing. <p> The authors detail special requirements of VLBI including atomic frequency standards, broadband recording systems, and antennas in orbit. Further major topics include: <ul> <li>Calibration of data and synthesis of images <li>Image enhancement using nonlinear algorithms <li>Techniques for astrometry and geodesy <li>Propagation in the neutral atmosphere and ionized media <li>Radio interference <li>Related techniques: intensity interferometry, moon occultations, antenna holography, and optical interferometry </ul> <p> <i>Interferometry and Synthesis in Radio Astronomy, Second Edition</i> is comprehensive in that it provides an excellent overview of most radio astronomical instrumentation and techniques.



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