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The United States Naval Observatory published its first annual volume in 1845, and since 1861 it has yearly issued a volume of observations, results, and discussions, so that Volume XXII (22) was published in 1875. These volumes have on average about 500 pages, and contain the official reports of the Superintendent to the Bureau of Navigation of the Navy Department; the annual introductions to the observations with each instrument; the detailed observations with each instrument, and their reductions; the results of such observations; and finally one or more appendixes which are special discussions of points in practical or theoretical astronomy.