Note: The current version includes only the North (POSS-I plates)
Note: Detailed introduction can be found in intro.tex (see also http://aries.usno.navy.mil/ad/ac.html) Direct links to Hipparcos and Tycho observations are provided from the relevant columns.
Note: SDSS is also available from http://www.sdss.org/
Note: SDSS is also available from http://www.sdss3.org/dr9/
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