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'''American Ephemeris and Nautical Almanac'''
 
<BR/>An annual publication of the U.S. Naval Observatory, containing
elaborate tables of the predicted positions of various celestial
bodies and other data of use to astronomers and navigators.
<BR/> '' Beginning with the editions for 1960, The American Ephemeris
and Nautical Almanac issued by the Nautical Almanac Office, United
States Naval Observatory, and the Astronomical Ephemeris issued
by H.M. Nautical Almanac Office, Royal Greenwich Observatory,
were unified. With the exception of a few introductory pages,
the two publications are identical; they are printed separately
in the two countries, from reproducible material prepared partly
in the United States of America and partly in the United Kingdom. '' 

==References==
''This article is based on NASA's [[NASA SP-7|Dictionary of Technical Terms for Aerospace Use]]''
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