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The Parallax Project at the Digital Research Library of the University of Pittsburgh makes available 10 digitized volumes of star data, calculations, and astronomical observations collected by researchers working at the Allegheny Observatory between 1910 and 1969. Originally published in the periodical Publications of the Allegheny Observatory of the University of Pittsburgh, data is provided in the form of articles, equations, tables, and graphs. Parallax Project visitors can browse scanned page images that preserve the layout and format of the originals, or search on a variety of criteria, such as Star Name, Declination, Parallax, and Parallax Error. A virtual keyboard is provided to make it easier to include Greek characters in star names. There is also a section on the Allegheny Observatory: its history ("born" 1859), its telescopes, and links to other observatories. For the astronomically challenged, What is a Parallax? by Dr. George Gatewood, Allegheny Observatory Director, explains.
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