The Einstein On-Line System (EOLS) is a collection of data, software, and documentation from the Einstein Observatory project and is located on a computer at the Smithsonian Astrophysical Observatory. The interface is menu-driven, terminal-independent, and is available via the Internet, SPAN, or telephone dial-up. Using EOLS, astronomers have

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This book includes four chapters devoted to techniques and interpretation of solar observations. The chapter on high spatial resolution techniques considers basic concepts, single frame analysis, interferometry techniques, and other methods. The magnetic field measurements chapter discusses a prototype polarimeter, physical components of

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A bibliographical search recently lead to the estimate that the number of published flux measurements of radio sources has considerably exceeded 500000, not counting measurements of other source parameters (like size, polarisation, variability, optical identification, etc.). This number is growing at ever higher speed. The data are scattered over

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